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I just replaced that, fun to get at, coolent temp sensor, use a 3/4 or I think 19mm 1/2" socket becouse the 1/2" is a bit longer than 3/8 so it just fits over the sensor, have that attached to a wiggly adaptor and aprrox. a 12" extension and it will go in through that hole you are using to look in at it just left of the input hose from AMM it will come out fine that way. Iv'e got rough idle on my 91 245 and I replaced the original fuel pressure regulator and the temp sensor and then it started and the idle is great but the real test will be in the morning.
good luck, lenny
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