Another shout out for John Bell's gauge work.
 

They really are superb. Also a stand up guy; tells the truth, responsive, keeps you informed of progress - and delivers when he says. Couldn't ask for better.

Thanks John!

jbell959 on this forum.



Custom tach with voltmeter:

http://forums.pelicanparts.com/uploa...1679189338.jpg


VDO vacuum/boost gauge built into a clock. Too many things about the 935 VDO gauge (or a faithful reproduction thereof) just tickled my OCD:

http://forums.pelicanparts.com/uploa...1679189338.jpg

His work speaks for itself.

Beautiful gauges, how are you controlling the vacuum reading?

Thanks

Have a dual AFR gauge on the way from John. Can only echo the above. John’s been super good to deal with!!

Seems interesting. How much does this modification cost?
How about the wiring.

Yeh, it really does :D

Dedicated hard nylon line for the boost gauge - internal diameter is tiny, easy to route. Needs to be plumbed below the throttle plate for it to register vacuum at idle - there's a few takeoffs on the throttle body. Above the throttle plate, wouldn't see vacuum, only boost - and would also register boost spikes the motor isn't really "seeing".

If you use a brake servo, various 924 & 944 N/A models had vacuum gauges from the factory, and were fitted with brake booster check valve 477.611.933.A. Has a 90 degree bend like the 911 one, and a take-off nipple. 928 used a straight check valve, also with a takeoff nipple, 928.355.660.03.

John will repair, refurbish/upgrade - or make unique instruments (including artwork for & screen printing custom gauge faces, which both instruments shown above had).

So it would depend on what you need/want done, and probably best to ask him for a quote.

That particular tachometer, for example, was an early one ('75), got an upgraded driver board to work with a MoTeC, calibrated, new face and repainted bezel/needles. So it wasn't $50. But you look at the instruments every time you get in the car...

The voltmeter is connected to +12V and negative internally, no additional wiring required as the tachometer needs those to work anyway.

Oh yeh - that hits the spot....


http://forums.pelicanparts.com/uploa...1679255646.jpg

^ Do you have a diesel engine in there? What’s up with the 5600 redline ?

The gauge looks fantastic!

I love Johns work...seeing this post makes me want to finally pull the trigger and do the voltmeter insert, then I can put the clock John redid for me back in its spot current occupied by a VDO voltmeter inserted into an old clock housing...but I did a direct wire run for the voltmeter from a switched source

Might as well be, LOL. Any "uncorked" 930 with cams/headers/half-way decent turbo should make ~80% of peak torque by 3000 RPM..

I did drive an Audi diesel wagon a few years back, and iI was struck by just how similar it felt to a CIS 930 down low - waft along on a monster wall'o'torque from just off-idle. Except it was N/A, and precisely nothing happened after 3000 RPM - so it would severely disappoint just exactly where things tend to get quite intense with a 930...

It's a twin-plugged/COP Motec 3.4 930 with a 3.2 intake manifold, Pauter rods, RarlyL8 equal length primaries and other goodies including SC cams. And a SBH G50.

Built for low/mid range throttle response rather than big HP numbers, power output is in the ballpark of factory-claimed output for a 996 GT2, based on what it puts down to the rollers.

Well, ignition soft cut is *cough* significantly *cough* higher than that...

SC cams, as good as they are for low/mid range punch (compared to, say, 964 cams, they move the start of the power band down 1000 RPM) - however, they make peak HP right there (5500 RPM), and the show's over by 6K. Dyno charts tell the tale.

So although the motor is insanely responsive compared to a CIS 930 and revs freely/happily to 7K (and beyond), not much point; I only do it to avoid a shift - or because it sounds glorious and makes the hairs on my arm stand on end/silly grin appear on my face.

Or there's a tunnel. 7K RPM in a tunnel with an open wastegate sounds like Armageddon...

Yeh, agreed - promised myself these gauges years ago, and very happy with them... Should have done it sooner...