I haven’t had a chance to look yet but my 98 12v should have two wires connecting to the tach pickup at the balancer. I need to tap into the wire with no voltage but I want to tap into it up on the fire wall. I’m horrible with wiring and color blind so can someone point me to which wire and it’s location, I need to tap into? 

Second image on the right hand side. The colors are textual as well.

 

Thanks Mike!

Gray/black

black/light blue

orange

Does it show which has voltage or not?

my grandpa used to wire air planes so I’ll get him to take a look at it too.

Edited April 1, 20205 yr by 98whitelightnin

Use the gray/black wire, pin #24 at the PCM.  The orange wire has the voltage and the black/lite blue is the signal reference

Thanks IBMobile, that’s exactly the dumbing down I need 

There are 3 plugs going into the pcm and they all have 32 pins. It looks to me like only the plug on the left has a little metal ring in pin 24 but no grey/black wire. 

I tapped into what I thought was the grey/black wire right off the balancer but I guess it was the wrong one because I get zero one engine speed. 2 more wires to go 

I've searched the internet for a 96, 97, or 98 12v wire diagram with no luck.  I was going off the 94 12v diagram for that gray/black wire. 

only two more options so I’ll tap into them today. Thanks for all your help