ls1 cutlass
it allows the use of most after market gages. The water will have to be an electric sender. The mechanical will not fit in the adapter. Others have drilled and tapped the existing plug and installed the sending unit. Search is not working but I was trying to find a recent post that someone stated you can get a signal off the existing water temp sensor that feeds the pcm and route the third unused termal to an electric gauge but I was unable to find that thread. Good luck


