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I have a 72 that I recently purchased. The car has a 75 motor in it. I am in the process of finding and replacing it with a correct dated 72 block. In the mean time I want to drive the car. The water temp gauge is not hooked up. I have a wire diagram of a 75 motor and a 72 motor. The 75 motor shows two temp sending units, the 72 shows one. Here's what I did.
1. Removed the sending unit from right side of motor, (it had two conectors on it and was broken) only a Dk Green was hooked to it. Left side also has a sending unit.
2. Purchased a new sending unit from auto parts store, check three stores they all showed a single wire pin unit.
3. Installed new sending unit.
4. Hooked the green wire fron right side og fire wall, ( the wire that was previously hooked up) and had no connection. I tested the wire and it is not conducting to the water temp gauge. It is the wrong wire or shorted some where.
5. I ran a seperate wire from the sending unit (new one on right side, single pin) to the gauge and it works, but it will read way too hot. I assume it does not have the correct resistance.
6. I checked corvette central and they show two sending units for a 72, one with two wires and one with one wire. The 75 block has two sending units one on the left and one on the right. My gauge in the dash I believe is the 72 gauge, it has the oil line. The water gauge only has one green wire to it.
So which sending unit do I need and what dom I hook up to make my water temp gauge work.
thanks cal
1. Removed the sending unit from right side of motor, (it had two conectors on it and was broken) only a Dk Green was hooked to it. Left side also has a sending unit.
2. Purchased a new sending unit from auto parts store, check three stores they all showed a single wire pin unit.
3. Installed new sending unit.
4. Hooked the green wire fron right side og fire wall, ( the wire that was previously hooked up) and had no connection. I tested the wire and it is not conducting to the water temp gauge. It is the wrong wire or shorted some where.
5. I ran a seperate wire from the sending unit (new one on right side, single pin) to the gauge and it works, but it will read way too hot. I assume it does not have the correct resistance.
6. I checked corvette central and they show two sending units for a 72, one with two wires and one with one wire. The 75 block has two sending units one on the left and one on the right. My gauge in the dash I believe is the 72 gauge, it has the oil line. The water gauge only has one green wire to it.
So which sending unit do I need and what dom I hook up to make my water temp gauge work.
thanks cal
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