Chris,
I have the Autometer Electric Oil Pressure and Water Temp gauges in an A pillar on my car. The one wire will run from teh gauge to the oil pressure sending unit just like the factory one does and it comes with its own sending unit. Same with the water temp. You run one wire from the gauge to the sending unit on the lower intake. You'll also need to run a "power" wire to a 12v source so that the gauge has power. I just tapped mine into a wire in the fuse box, and hooked the lighting into my dash lights. Nothing to it.
Chris
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