I need to know what PCM wire to tap for a 5 volt signal for my external MAP sensor... can anybody help me out?

EDIT:

I found this link on Rob's website...

http://shbox.com/1/1995_pcm1.jpg

My car has an OBDI conversion, would this apply? I can easily find out by comparing the color of the 3 MAP sensor wires or even using my multimeter but I'm lazy and I need confirmation

 

looks like the grey wire from the stock map sensor.

 

What about the ground... can I just ground the sensor to the body or do I have to ground it to the stock MAP ground wire??? I already have the wiring run to ground it on the chassis on the battery ground next to the 12v distribution box.

 

a body ground is fine as long as it can handle the current. Seeing as how small the wire is, you'll be fine with any ground you find

 

On that diagram:
The Grey is your 5 volt reference to the sensor which powers it.
The LT GRN(light green) is your signal from the MAP back to the PCM.
And black is you common ground.

 

Omar, if the STOCK MAP sensors has a 5 volt signal to indicate atmospheric pressure (0 psi), how are you going to get it to trun on at say 3psi? With the stock MAF wont it start spraying @ 0 PSI if you have the controller set to turn on at 5 volts? Are you using a 2 bar map or the stock map? If your using the 2 bar, will that affect the cars tuning? Just wondering because i need to run my signal wire as well.