[Dave at Pelican Parts]

On the D-jet cars, the main metering is done by varying the amount of inductive coupling between two coils of wires. There aren't many instruments out there that will measure that--it's just not common any more to need to measure that sort of thing.

I know of people who have looked into making a digital equivalent of the MPS (the Manifold Pressure Sensor, the part that supplies the varying inductive coupling). Very smart people, BTW. It isn't worthwhile to do; measuring the manifold vacuum is easy, but turning that into a changing inductance digitially is just too big of a pain. Pretty much everyone I know of who has looked into that has concluded that it was easier to change over completely to a digital system like Megasquirt, and pull the signals out of that.

--DD