Help me get some good info in this thread. Instead of wiring in to were we are for the guages can we wire directly to the back of the guage without the circuit board. I don't see why not, so help me line out what goes where.
In the pic is the tach(left when looking at the pic) speedometer on the right.
Each has 3 connections. I labeled what the circuit board is printed with, with the same letters in red.
E is ground
IG is power
- is the tach wire.
S is VSS


http://img691.imageshack.us/img691/449/imgp4070a.jpg


To break out both plugs
From a 1991 firebird service manual,
connector C2 (upper connector)
1 brake warning indicator, tan/white
2 ground, black
3 instrument cluster illumination, gray
4 n/a
5 n/a
6 n/a
7 LH turn indicator, light blue
8 hi beam indicator, light green
9 RH turn indicator, dk blue
10 fuel gage output to sender, purple
11 supplemental inflatable restraint (air bag), brown
12 n/a
13 service engine soon light, brown/white
14 shift indicator, tan/black

connector C1 (lower connector)
1 tachometer , white wire
2 ground from hi beam LH turn RH turn and cluster, black
3 cluster illumination, gray
4 security indicator, gray
5 coolant temp gage output, dk green
6 n/a
7 n/a
8 oil pressure gage output to fuel pump/oil pressure sender, tan
9 ignition power from gage fuse, pink/black
10 n/a
11 n/a
12 ground from seat belt indicator/voltmeter, black
13 seat belt indicator, yellow
14 vehicle speed signal, gray (except vin E, tan)

 

did you ever figure this out? ive been wondering the EXACT same thing with my project

 

What is there to gain by going directly on the cluster board itself? I made my gauge connections at the connector where the cluster plugs into.Didnt mess with the cluster at all and I can always put it back to factory.I have a few clusters and have swapped them in and out within mins.