I was hoping Pat would see this thread, he would know for sure. As for the gauge, I just bought one of the inexpensive mechanical gauges and it has the same (1/8 npt) thread (I think) as the place where the sender went. So I just put a nipple and coupling on it and screwed it right into the block. As soon as I fired the engine up it climbed right to 50-60 psi so I knew it was my sender. That is all you will have to do too.

Don