The computer reads off the sensor in the water pump, and the sensor in the head is for the temp gauge in the cluster. I just replaced my sensor in the water pump not too long ago, you should be able to swap it out and only lose a tablespoon of coolant. Best way to get at it is underneath the car, and have the new sensor ready to go in as soon as you pull the old one out. Piece of cake.
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1993 BGGM Z28, stock LT1, T56, 175k on original motor, basic bolt-ons. 273 whp, 308wtq. SOLD 
2001 Black WS6 TA Stock....for now.... 
DD: 2007 Dodge Ram 1500 quad cab sport, 6 inch RCX lift, 35x13.5 tires, 20x9 Fuel wheels, 20% tint all the way around, ZZ customs exhaust, Diablosport Trinity T1000 programmer.
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