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Re: 91 f150 temp guage
There are two temp related sending units on this truck. One is called the coolant temp sending unit, has one wire, and should be just to the right of the dist. The other is the engine coolant temp sensor, it has two wires, and should be to the left of the dist. The temp sending unit with one wire is the one you want. If you use the other, it will cause driveability problems, because it sends info to the computer to help control spark and fuel delivery. If you have the 4.9, it is located at the rear of the block under the end of the exhaust manifold. Good luck.
Later
Ed
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