Finally got the gauges in. These are 2" gauges an require a 2-1/16" hole. They are electric gauges so they need power instead of the wired or tube fed sending units. I had the same issue with the oil pressure sending unit that I had with the water temp sending unit. The threads are 1/8" npt but they seem really shallow. I needed to add a 1/8" npt close nipple and coupler to get the oil sending unit to fit. It was too wide to go in close to the block. I had to take a 1/8" npt pipe tap and run it through the oil pressure hole just like the water temp hole to cut the threads a little deeper. It didn't take much. I could twist the tap in by hand up until the last couple turns that I put a socket wrench on it but it wasn't cutting much out at all. Then took a q-tip and pulled out just a few file shavings. Then the 1/8" npt nipple went in just fine.
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