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Join Date: Jul 2003
Location: Glorious Pac NW
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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:




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:


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'77 S with '78 930 power and a few other things.
Old 03-18-2023, 05:49 PM
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His work speaks for itself.

Beautiful gauges, how are you controlling the vacuum reading?

Thanks
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Rutager West

1977 911S Targa Chocolate Brown
Old 03-18-2023, 05:56 PM
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Have a dual AFR gauge on the way from John. Can only echo the above. John’s been super good to deal with!!
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SEARCHING FOR ENGINE 6208326 (last seen in car with VIN 9111101452)

911E Coupe -70

Carrera 3,2 -84 Sold
Old 03-18-2023, 11:34 PM
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Seems interesting. How much does this modification cost?
How about the wiring.
Old 03-19-2023, 04:07 AM
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Quote:
Originally Posted by rwest View Post
His work speaks for itself.
Yeh, it really does

Quote:
Originally Posted by rwest View Post
how are you controlling the vacuum reading?
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.
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'77 S with '78 930 power and a few other things.
Old 03-19-2023, 08:59 AM
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Originally Posted by joe912/62 View Post
Seems interesting. How much does this modification cost?
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...

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Originally Posted by joe912/62 View Post
How about the wiring.
The voltmeter is connected to +12V and negative internally, no additional wiring required as the tachometer needs those to work anyway.
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'77 S with '78 930 power and a few other things.
Old 03-19-2023, 09:53 AM
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Oh yeh - that hits the spot....


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'77 S with '78 930 power and a few other things.
Old 03-19-2023, 11:59 AM
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^ Do you have a diesel engine in there? What’s up with the 5600 redline ?

The gauge looks fantastic!
Old 03-19-2023, 01:46 PM
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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
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1977 911-S Modified (3.0 SC Motor/Flares)
Old 03-19-2023, 03:42 PM
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^ Do you have a diesel engine in there?
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.

Quote:
What’s up with the 5600 redline ?
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...

Quote:
Originally Posted by LJ851 View Post
The gauge looks fantastic!
Yeh, agreed - promised myself these gauges years ago, and very happy with them... Should have done it sooner...

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'77 S with '78 930 power and a few other things.
Old 03-19-2023, 04:42 PM
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