Quote Originally Posted by rockusaf View Post
The engine was a 1991, no vortec, I couldn't find anyone that had anything that would work, picked up Autometer #2268 that is 16x1.5 with an 1/8NPT tapped hole figuring I could drill/tap it to fit the sensor if need be. I'm going to ask a dumb question (seems too easy so it'll probably never work) before I drill a hole in a $13 piece of brass, any reason you can't just tap the tan wire off the stock LS3 sensor to the tan wire going to the gauge and get it to work?

Rock
I just done that on a swap I done for a guy at work. We used the factory ls sensor in his truck and seems to be working just fine.