Its been awhile, but the trucks been running, i ended up putting in a new lq9 and got rid of the garbage lq4 i bought. The truck runs great, pulls hard... all my gauges work besides my tach.
Ive got movement on my tach, it says it idles at 100 rpms and when im in the throttle it goes up to 1500 or so.
Right now ive got the tach wire from my new pcm to the wire to my factory tach. I got a 680ohm resistor 1/4 watt with a 12v switched power source. Anyone got any ideas of solutions? Thanks.