thefox wrote:
yep its the stock wireing harness from the 85 z28 do you know if there is a ground wire somewhere for that
That's not the issue. You see, the sensor in the passenger side head isn't for your temp gauge.
More background info is needed here. When you swapped in the LT1 did you keep it all stock style LT1 and convert the harness to run all the electronics and ignition system?
Either way you do it, you need to hook up that green 'temp sensor' wire to the stock 3rd gen temp sensor that you will need to reuse and screw either into the passenger side head where the one that's there now is or find somewhere else like the wAterpump.
IIRC the sensor in the passenger side head of an LT1 is just a temp switch like for cooling fans. Nothing to do with the gauge on the cluster.