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Originally Posted by cbatters
The ground lead of A22 is ECU Signal Ground. You don't want to tie Chassis ground to Signal ground at the MAP sensor because it would create a ground loop. (Chassis ground and Signal ground should only be tied at one point which in this case is at the ECU.)
Low power instrumentation like A/F and Boost meters should be connected to signal ground. Incorrect ground reference of an A/F meter for example, could cause your A/F to change everytime you step on the brakes or turn on your blinkers.
Clint
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That's good stuff. Sounds like you do this for a living. I just PM'd you with my results from hooking up the Autometer boost gauge MAP sensor to A-22. Also included is the info you were asking for.