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one on top by the thermostat, and one in the block back below the exhaust manifold passenger side. look for 90 degree rubber boot electrical plugs....red I think.
Some of them are in the thermostat housing (mostly later engines), but most are actually in the block. Look just below the #6 intake runner & thats where you'll most likely find it.
Edwin
The sensor for your gauge is in the block below the #6 intake runner - I hope your arm bends in two different directions (Take out the starter it's easier to change the sensor)