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My truck has two green wires on the driver's side. One is for the temp sending unit, and the other runs to the A/C compressor. IIRC, the one for the compressor is lighter color green. The sending unit wire also has a protective sleeve over the last few inches of wire, since it is so close to the exhaust manifold.Do you have a temp sending unit in the driver's side head? This is the stock location for the gauge sending unit. There may be other temp sending units for emissions devices, but this one is for the gauge.Some OEM sending units use a post and straight connector, while older ones like mine use a button fitting on the sending unit and a flat wire connector that slips over it.Bruce
...The only green wires coming out of [the original harness] is one connection for the AC compressor, another Green that appears to go to the HEI distributor. Both these green wires have double spade connectors on the ends of them and are keyed correctly for the AC compressor and the HEI distributor....