FS-935 Boost Gauge with additional Tell Tale Reset Needle and Key. Replace the Clock.
 

3 Photos below in next few posts.

I have vintage Boost Gauge with the tell tale needle and the reset key like in the 935 race cars. This gauge is a direct perfect fit replacement to your factory clock.
A replacement boost gauge is a necessary addition to your 930 due to the long known and agreed to inaccuracy of the factory boost gauge in your tachometer.
PHOTO posted below in my 2nd post.
Very easy to install using the small tube to the nearby brake booster vacuum line only 2 feet away in the trunk on the opposite side of the dash board. Installation kit is included. New light bulb and connector plugs into existing clock light plug connector.
The vacuum line is the best way to install a boost gauge.
The additional tell tale needle indicates the highest boost achieved and the additional needle stays there until you use the key to reset it. This way you will notice an intermittent boost creep failure so you can easily notice if your wastegate diaphragm is starting to leak.
I blew an engine this way and did not notice when my wastegate diaphragm was starting to leak.
You may not notice a quick one second over boost with a regular boost gauge without the tell tale needle alert.
This tell tail needle is worth the money compared to rebuilding a blown engine due to intermittent temporary over-boost.
All Offers over $495.00 will be accepted at the end of 5 days.
Plus your choice of postage.
Email me for detailed photos.
Post your replies or click on my screen name to send me a PM or you can send me an email.
Thanks for your interest.

Can you put a picture on here? I would specifically like to see the key also.

Photo Boost Gauge 935 style with Tell Tale plus reset key
 

Photo Boost Gauge 935 style with Tell Tale Plus Reset Key and Installation Vaccum Line and Connector.
http://forums.pelicanparts.com/uploa...1313277664.jpg

Very cool. I have the same one but no key. I wonder if anyone on these forums knows how to make one :)

Let's see a close up of the key and maybe.

The key is the little straight metal thing in the picture and the inside diameter of it that engages with the triangle shaped stud in the middle of the gauge is triangle shaped to fit it.

When I bought my car it had a VDO/NHS boost gauge with telltale and the adjustment key had been placed on the key ring to the car by the previous owner.
I think i had the car for a few weeks before I figured out what it was for!

I bet NHS has more of them.

PHOTO of back of gauge with installation kit and key which quickly resets tell tale needle from the front of gauge. Newback lit bulb and socket plugs into factory clock light socket..........................http://forums.pelicanparts.com/uploa...1313347409.jpg

935 934 930 Vintage Boost Gauge with Tell Tale Needle and Reset Key. Installation Kit
 

935 934 930 Vintage Boost Gauge with Tell Tale Needle and Reset Key. Installation Kit.http://forums.pelicanparts.com/uploa...1313361424.jpg

If that had vac on it i'd rip your arm off.... Do you think, as it's clearly from NHS, that they are the same inside, and all i'd need is the face, and rotate it?

The VDO/NHS boost and boost/vacuum gauges are not the same inside.
Here is a pic of the inside of my 2bar boost gauge with telltale needle.

You can see at rest or zero bar the rack gear as I call it is all the way at one end of it's travel so there is no way it can go farther and read vacuum.

Also a pic of the back side of the telltale needle and it's light friction clutches that look like little bronze wavy washers sandwiched between flat washers to give the needle it's smooth consistant light friction during movement.

These were origonally made by VDO for the 934 and 935 race cars. Prototypes like the 936 and 962 had them too.
The driver was not supposed to have the little tool for resetting the telltale so the crew chief could look and see what level of boost the driver was turning it up to on the track.
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Hi JBL,
The Andial website says that Andial does not not offer these boost gauges any more and the they recommend NHS, North Hollywood Speedometer as their new supplier. Also, it's nice to know you can still get parts from NHS. They are a very well respected vender for many decades and nice guys who will still talk to you on the phone.
Also, you can still use your factory vacuum gauge on in your tachometer. I also used both boost gauges for the vacuum reading and also it is nice to check one boost gauge against the other.
The boost gauge is the most important instrument in a turbo engine.
Does anyone want to see a photo of a worn out wastegate diaphragm?
I cracked a cylinder because of a failed wastegate diaphragm.
Once you see it, you will want to watch that you don't have boost creep and blow your engine.

Cracked Cylinder due to Over Boost
 

I just order a Boost gauge for NHS - without the tell tale as they say they can't be made anymore becuase of lack of parts.

If they had the parts it would cost 750.00

So I order mine without and it was 279.00 with shipping...

GLWS :)

The reset key is very simple to make. Just take a rivet tube und crush it on three sides to form a triangle on one end. Drill a hole through the other end for a ring, and viola. Just take your time when crushing the three sides until it fits right....

Thanks for those pics Jimbo...

say, care to share the process for disassembly and re-wavy-washering one's Tell?

Mine's floppy floppy, would love to give it a love-stitch if ya know what I mean 8-).

Great point about the 2bar being more accurate than the 1.5 due to the low response of the low extreme - totally true, mine's asleep then awakes suddenly. Would still love to have a vac reading tho 8-/...

Factory 935 Boost Guage
 

Here ya go ....

OEM Boost Guage face with tattletale and key (in situ)

http://forums.pelicanparts.com/uploa...1313369995.jpg

OEM Tattletale Key

http://forums.pelicanparts.com/uploa...1313370037.jpg

http://forums.pelicanparts.com/uploa...1313370056.jpg

Very Nice !
You better put a key ring through that hole or you may loose it.
You'll never find one again like it.

Good idea. What do you think of this solution? :D

http://forums.pelicanparts.com/uploa...1313709411.jpg

That's freaking awsome! I hope I didn't lose mine... I remember seeing it in the glove box when I bought the car years back - which I cleaned out the next day after bringing it home. I never knew what it was... Hopefully I still have it. :(

Thanks for this thread, I have the same boost gauge in my project car and now I know how to make a key!

Can you make that two..??? :)

When did the factory start to use the christmas tree boost gauge in the 935 cars ( or was that used in later Porsche race cars ) or was that the first boost gauge and the teletale used later?

I have read that the Kremer 935's, originally experimented with the LED boost gauges aka Christmas Tree Gauges, but the team found them not accurate at that time and then used the additional Tell Tale resettable needle boost gauge. It's very functional and allows a driver to concentrate on the road and not be preoccupied with watching the boost gauge so as to not obligate the driver to communicate to the pits the highest boost deviation.

In as much as Kremer cars were built later but within the time frame as the factory 935 cars I wonder if the factory started with the LED gauge with the first Turbo cars. It seems more high tech as opposed to the Tell Tale so I just assumed the tell tale was first ( also when was LED developed. I always thought it was more current than in the 70's). As with the Tell Tale there were two manufacturers the 80's. The one that came with a 1983 Kremer is a VDO and the other ( in a 1977 which I had assumed was updated from a tell tale ) is branded Porsche SC which I now think may have come earlier, possibly from the first turbo cars, the 934 time or before. I had previously assumed the LED was later but now wonder as a Porsche SC ( Super Carrera ? ) would be a designation of a early turbo. Anyone have any early photos ( seventies) of any Porsche turbo race car ( turbo race cars were on track before the 934-935 era ), that would show these different gauges in the cars?

My experience with the VDO tattle tail gages is they are junk. The first one I had lasted a year then the TT broke. Replacement didn't last that long. WAY overpriced. I have a fuel pressure gage with tattle tail that I bought from Grainger for $50 that has lasted longer.

Yeah they are way overpriced, especially now that there is renewed interest in them but thats the way it always is with stuff made for Porsches.

They are made with thin aluminum cases to be light in weight for racing origonally and some of them work perfectly and some don't. There's not much to them on the inside but the brass parts are precision made like an old clock.
Mine is around 7 years old now and works perfect. It was in the car when I bought it.

To test it I've set the telltale needle higher than boost goes and then gone out on the interstate and floored it to see if the telltale holds the boost needle back at all.
The telltale friction clutch is set light enough on mine that it doesn't hold back the boost needle at all and the telltale peak hold stays in place all the time.

A buddy of mine bought a new one with telltale from NHS a few years ago and his telltale has always been too stiff to move freely or something.. even after sending it back once to have the telltale clutch tension adjusted looser.

I have 4 VDO teletale gages in 4 cars. One I have owned for 12 years, another 8 years and all were in the cars for many years before i got the cars. Two of them were swapped with the clock when they were just a few years old. Maybe I am lucky but all of mine work just fine. Could be the later ones were not made as well as the early ones were or were kept in a moist or a freezing or high temp climate as that might effect the internals. Always a good idea to get one from or in a well kept car.

Mine were aftermarket VDO made for the masses and not a 935. Paid something like $250 a decade ago for the first one. The TT needles were too tight and held back the boost needle a bit. They broke and just dangle free.

Does anyone have a tattletale key available for trade or sale? Long shot, but thought I would ask.

Try Palo Alto Speedometer, they make up reset keys from time to time. Great people for repairs and refurbishing all VDO current and vintage gauges.

Palo Alto Speedometer: Porsche VDO

Pop quiz... anyone know what the below part(s) are? They are pictures of the adjusting pin / jet in the back of the telltale boost gauges (inside the connection of the pressure line) which is supposed to allow adjustment of the amount of air flow to the gauge to provide enough pressure to move (both) needles but not too much pressure that the gauge is erratic and not smooth operating... I sent my gauge to North Hollywood for repair and they fixed the clutch that was loose but I could still not get the gauge to move (both) needles correctly. I removed my adjusting pin and in the pictures below I think I have identified the problem. The first picture is from Jeff at NHS which clearly (well as clearly as you can get with a cell phone) shows a pin / jet with a hole in the center thus allowing a certain amount of air / pressure to pass through the needle / jet. The subsequent photos are mine which clearly (same comment as above) show a mushroomed / squashed pin with no hole for air to pass. I made an attempt to remove some material and open up the hole with no luck. I included a picture of the screw end that also looks like it has a very small pin hole as well. Jeff tells me he can blow air through his at NHS. I cannot. My questions are; How does this Pin / Jet work? Adjusting it in and outward clearly changes the air volume / pressure the gauge is seeing but how does it do that and if I shorten my pin to open up the hole will that disable the proper functioning of it? Anyone have a good spare they would be willing to part with? I've spent a lot of time and $ on getting the gauge working correctly and feel ever so close... :-) Thanks for the support of this excellent forum. SmileWavy



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there's a tattletail key on ebay for $100.00, not mine.

I have no problem resetting mine with fingers without the key. This 2bar vdo has been on my car for over 10yrs now (prolly alot longer with POs) and it still works fine. Newer had the key though but there was some glue blob on it before I removed it as it looked tacky. I dont want anything hanging on it as I feel it could put minor stress on it and it could become loose fit after some time.

boost gauge
 

Hi all does the reset key wind to reset needle once boost has been reached or do you press the key....

You just turn it back where ever you want

FS: 935 Boost Gauge Tell-Tale Reset Key, $17.12

http://forums.pelicanparts.com/uploa...1597255063.jpg

I'll take four. PM or email me for paypal or another method of payment. Can you put all 4 in the same box priority USPS to reduce shipping expenses? $17,12 X 4 = $68.48 plus $7.90 priority USPS + paypal fees sound right? Thanks,
Tony@Voitureltd

Here is a of photo of my boost gauge...same key but only have (1) key. I had to replace the hose behind the dash as it was dry rotted and cracked causing erroneous boost readings. North Hollywood speedometers tested and calibrated. Works great!
http://forums.pelicanparts.com/uploa...1597318828.jpg

I will take two of them. Can you email me? my user name on here @gmailcom

Thanks, Brad

i will take one... please PM the payment info?

anyone CAD plating there's? perhaps we can find a somebody doing a batch. its the same cost whether its 1 key or 1000 sort of speak.