LS1 aftermarket gauge hook up

Maybe this has been gone over before, but I'm going to do it again if it has..

If you need to hook up an aftermarket temp gauge to your LS motor you will soon find that there is not many choices out there. Unless you want to special order a sending unit that will thread into the LS head(12mmx1.5)

I bought an off the shelf gauge this weekend and installed it using a factory PCM temp sending unit. You cannot use the same sensor as the computer reads as it will confuse the computer, You have to install another one in the passenger side head. You'll also need a pig tail to wire it in with. I used an old plug off of a left over harness and it works great. Just hook one wire to ground(black) and the other to the sensor input on the gauge. As long as you use an analog type gauge it should work good. Now I can see what the motor is really doing. No more guessing at the Porsche gauge.......

You bring up an excellent point. Same stuff happens when people want to use a ricer AF guage and hook it to thier factory O2 then wonder why thier car runs like ass.