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Originally Posted by BLACK94TT
I don't remember exactly where I grounded the Autometer gauge. I guess it doesn't matter anyway, since you say the only connection I'm concerned with is the signal to A-22. I have no idea why A-22 doesn't even need a ground. 
I'm going to check this out tonight. To be able to log boost will be a huge help when tuning. I'd like to go out there right now and try this.
I'll post back with results. |
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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1991 Stealth RT/TT - Firestorm Red - 193K Miles / Original Owner
Maint: Castrol 10W40 / Mitsu Filter / Rislone
Replaced: 2X clutch / 3X brakes / 2X front rotors / 2X ABS HU / 1X NGK Plugs / 1X Ball joints / 2X Antenna mast / 1X Active exhaust cable / 1X Windshield / 1X Fuel FIlter / 1X Struts / 1X rear rotors / 1X Front Head / VSS / 1X rear wheel bearings / 1X Transfer case (warranty) / 1x Tie rod end (drivers side)
Overhauled: Starter, IAC, BISS, CV Boots
Upgrade: SilverStar Headlights / ebay "Xenon" Fog Bulbs (no more yellow!)
A/F Gauge / MAP - Electronic Boost Logging / MMCd Data Logger
Pending Projects: Steering Rack