cluster question - wiring issues. help!!

[jeremy]

I can't wait to see the finished product

[DiscoStudd]

6. i have white wire in my harness, and there is nothing on the chart for a white wire. what the hell is it? also, it's possible that the wire is tan or yellow, i couldn't exactly tell in the dark.

White wire, IIRC, is for the Tach signal (at least it was for 85-89 Grand Ams, should be the same for all GM's.)

[stockgp]

good news. i got the ub3 to power up. my biggest problem right now is that i am missing a few wires, and i still don't know where the tach signal wire goes. i'm pretty sure now that the white wire is the tach signal, but on the chart in the upgrades section, there is no listing of a white wire or a tach signal port. so, fellas. a little help?

 

here;s what i still need to know:

 

1. where does the white wire for the tach signal go

2. where do i tap into for the display dim enable wire

3. where do i tap into for the bi directional serial data link between the cluster & ecm

4. what is the vf dimmer and where do i tap in for it

 

i think that's it. thanks in advance