After reading this thread I ordered one of these from Amazon. Can keep my phone charged while watching the Volts. Not as slick as a built-in in the tach, but way cheaper.

http://forums.pelicanparts.com/uploa...1446525984.jpg

I have this one in my car. It definitely is just a monitor. There are 3 lights - green, yellow and red. There was nothing that came with it that said what each light means. My guess is green means charging, yellow means not charging, and red means draining.

Last night I was driving home in bad weather. I had the wipers, headlights, oil cooler fan, fog lights and A/C all on. At one point I tried turning off the A/C and the fresh air blower on. When I did the voltmeter light went from yellow to red. I turned off the fresh air blower and turned the A/C back on and it went back to yellow. I guess the fresh air blower added to everything else was just pulling more load than the alternator could keep up with.

I did, my alternator was not overcharging and there was no short. Just an old battery that was nearing it's end that probably internally shorted due to vibration on track. AGM batteries tend to be more vibration resistant.

cool diagnostic tool. Just pug it in now and then to be sure!!!

Yes, lots of similar items...just leave it in place and no worries.

Very cool looking unit. Just ordered one as well. Did you get this installed? If so where did you choose to mount the light?

I'm going to cross link this thread here since there is some good troubleshooting tips
http://forums.pelicanparts.com/porsche-911-technical-forum/890840-these-voltmeter-readings-normal.html

The addition of an analog gauge to the TACH is a beautiful thing....

If you are in the market for an AFM, the PLX unit has a Volt Meter. Is also a relatively cheap way to add multiple gauges. In one digital gauge, I have Voltage, AFM, and Oil Temp.

PLX Wideband O2 Air Fuel Ratio Sensor Modules, Gauges, and Kits

Thanks for posting this!

Hmmm.. Reading that the controllers have a 0-5v analogue output, I wonder if that is the way to drive my combo gauge? (Converting a fuel/oil gauge to a volt/ Air fuel gauge)
All I would have to do is calibrate the voltage coming out of the controller using a simple electronic circuit (which seems like an easier task).

I also noticed that Innovate has a similar analogue output option.

Any opinions or experience with doing this with either one of these controllers?

LC-2 Wideband O2 Digital Air/fuel Ratio Controller

PLX Wideband O2 Air Fuel Ratio Sensor Modules, Gauges, and Kits

Look on page 3 of this thread.. We built a little box to convert a narrow band O2 sensor signal to work on one size of a combo gauge and used the other side to show voltage.

Wideband is much more complicated so my solution for that was to use the guts of an Innovate AFR gauge and transplant them into a VDO case. Here is a pic.



http://forums.pelicanparts.com/uploa...1450448767.jpg
http://forums.pelicanparts.com/uploa...1450448847.jpg

Some WBO2 controllers have a 0-5vdc output and you can map the 0-5 voltage curve as you wish. The techedge devices offer this, you can create the 0-5vdc curve any way you want. For example I can make 2.5vdc=lambda 1.0 if I wish. I can make 5v be lambda 1.3 or I can make 5v be lambda 0.8

I bet some of the other controllers also offer this mapping, I'd read the docs before you buy.

I know the Inovate LC-2 can do this also.

Basically, if you have any gauge that swings fully with 5vdc you can make it do whatever you wish if the controller has fully programmable 0-5vdc output. But if the gauge is 0-12vdc this will be harder to control and may require external circuitry.

I like that... Looks like I will be making one more modification to my RS build... I have plenty of space since I deleted a/c and heat in the car... I can use those gauges in the dash trim... just drill the trim in the area where the heater controls were before...

The gauges can be found on ebay (copy-cats of course) at a very decent price... I bought a set to do the control panel for starting the 912 engine on the stand...

I will get the volt meter as well...

http://i151.photobucket.com/albums/s...psvl6pjzpo.jpg

Install them here (lousy pshop attempt...)

http://i151.photobucket.com/albums/s...ps3swk7r4c.jpg

Thank you!

The AFR gauge you built below, is that the same size as the clock? I love it! I have that same Innovate analog gauge would love to build what you did. You mention a thread covering this gauge. Can you share that thread please?

update... anything new jbell959...? also, where is your earlier mentioned build thread on the gage...? thx for sharing...))

You do NOT have to tip the tach on it's side to do it.

Most are done with the tach upright.
I think it looks better that way. Like it belongs there.

M


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DANGER! install volt meter now!!
 

...

My battery had an out gassing experience this week.

I had recently had my battery die on a fairly regular basis and bought a voltmeter which plugs into the cig lighter to attempt to monitor my voltage. The gage was pretty flighty and every so often would spike over 15 V. I figured it was a crappy gage and paid not attention.

On Monday I drove down to Petersen museum no problem (battery had been on a tender) but it wouldn't start 2 hours later. We bump start the car and head on our merry way when we smell something foul...which turned out to be the battery.

I made it home (40 min drive) and when I checked the battery (Kinetic HC800) it had swelled up pretty nice.

So anyway, now I need to pull the alternator as I have a faulty VR. I had the alternator rebuilt about a year ago so this is a bummer.... I was hoping I wouldn't have to pull this sucker for a long time since it was such a PITA.

Just got this online.
http://forums.pelicanparts.com/uploa...1455726820.jpg

DANGER! install volt meter now!!
 

Has anyone experienced these type of gauges being a little loose in the factory lighter leading them to want to fall out?

It as if the internaldiameter is just a little larger than current designs.
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