Where to put water temp probe and oil pressure gauge on engine?

Howard1784 said

Weld a bung in a piece of metal and place it in the upper rad. hose for the best and most accurate reading.

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I've done just that, but the problem with that idea, is if you get an unknown slow leak, say, overnight, and don't notice, then start up the engine, it can overheat badly before the gauge "says" anything.

SB Chev started putting the sensors in the heads, which prevents that problem.