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If you look on the right hand side of that summit page it has a list of suggested parts, one of which is the correct sending unit for that guage ($15 or so) i'm sure it comes with installation instructions as well
I had to take a peice of tubing about 4" lg and put two bungs and a nut on and splice it into my radiator hose for some extra spots for senders the nut is for a wire to run back to the block for ground for the sender. There is no spots on the head. Can you drill and tap one, I have not looked in to it. The sending units could be the same or they could be diff. you have to get the specs. from the manufacturer.