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Old 03-18-2004, 11:54 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,794
photos of gauge cluster boost gauge, part 1

I'm further along setting up a gasser economy/vacuum gauge as a boost gauge per jbaj007's instructions (Turbo boost guage advice needed).

See the photos at http://photos.yahoo.com/tabijan in the 126 boost gauge album.

I hooked up a pressure source to feed the reworked gasser economy/vacuum gauge and an Autometer boost gauge for reference.

photo 1 - no pressure input

photo 2 - a little over 5psi on the Autometer gauge an no movement from the gasser gauge

photo 3 - by 7psi on the Autometer gauge the gasser gauge starts to respond

photo 4 - by 10psi on the Autometer gauge the gasser gauge is into the red zone. Ooooh...

photo 5 - by 13psi on the Autometer gauge the gasser gauge is
a half pointer width from the peg.

I don't think the Autometer gauge is accurate. I have a seemingly better made Craftsman vacuum and pressure gauge that reads 1psi higher than the Autometer gauge across the scale. The Craftsman gauge only goes to 10psi so I can't use it to calibrate the gasser gauge. I'm not after 5 decimal places of accuracy anyway.

This was my first shot at resetting the pointer and it looks close to where it should be. I'll know better when I do test runs with the Autometer gauge in the SDL.

It bugs me that the gasser gauge doesn't get off the low end peg sooner. If I calibrate the gauge to peg at 16psi like I'd like it to, it might not get off the low end peg until it senses 10psi.

Sixto
95 S420
87 300SDL

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Old 03-20-2004, 01:38 AM
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Join Date: Jan 2001
Location: California
Posts: 2,068
Wow that's pretty cool. I wonder if you can reposition the stopper needle so it'll read higher than 16psi?
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Old 03-20-2004, 01:44 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,794
Funny you should ask...

Pointer sweep between the pegs is ~90-degrees. I tested just now and it takes ~220-degrees of sweep to get 0-16psi. That's consistent with the 7psi range I get between the pegs. So if you have the pointer relaxed while pointing to the lower left corner of the fuel pump icon (~5-degrees to the left of vertical), it'll hit the outside of the low end peg (travel is unimpeded in a 126 cluster) at 8psi. Bend it over the peg and it continues from 9-16psi between the pegs. The somewhat nice thing if you think in psi is that a horizontal pointer is 5psi.

Sixto
95 S420
87 300SDL

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