Engine: Dual Needle Boost Gauge

[jlmccuan]

Does anyone have a source for the gauge used in Ron Hall's car? It had two needles for comparison of manifold pressure vs supercharger boost.

[DEEPNHOCK]

Viair comes to mind....

http://www.summitracing.com/parts/var-90083/media/images

or Westach

http://www.westach.com/catalog/index.php?page=PAGE3s.html

[jlmccuan]

I didn't see any of those that could register 2 vacuum/boost inputs. It's very possible for the supercharger to be building boost while the manifold registers vacuum. The interplay of the two reveals a lot of information. Maybe an aircraft gauge?

[Colgate Studebaker]

Jim, I know that Jim Pepper had a lot to do with Ron Halls car. If you contact him, he might be able to shed some light on that gauge. Hope you get your answer, Bill.

[jlmccuan]

My buddy John Shanahan did the wiring on Ron Halls' car for the '93 effort. He recalls it as an aviation instrument. Good idea about Jim Pepper. I'll ask him tomorrow. Thanks.