I have a 1971 55HP Chrysler. I want to put on a water temperature gage. I went looking at some today. On the top of the head to my engine is the thermoswitch. It looks to be about 1/4 inch or 3/8 inch hole that it is screwed in to. The gages that I saw all had a thermoswitch that was much larger in diameter. Can I buy and put a temp gage on and use my old thermoswitch? It also looks like its the original. Looks like it is actually a part of the head. Seems like it will be a pain to get out or possible break off. Are there any temp gages with the same diameter thermoswitch or is mine so old that it is no longer made in that diameter? Any advise on this mater would be greatly appreciated, also can you tell me who makes one that would fit in the same hole if I do need to put a new thermoswitch in.
thank you
thank you