Re: 1966 Chevelle Temp Gauge not working ?
If the connections are good, you will see voltage on the green under hood wire with it disconnected from the sender (of course the key has to be on).
This is because a voltage divider is formed between the sending unit and the gauge assembly. So with an open ( green wire disconnected from the engine sending unit, your red probe of your voltmeter touching the green wire connection only and the black wire of your voltmeter to a GOOD ground), you will see some voltage with the key on.
In an earlier post you claimed you had continuity from the very end of the green wire at the engine side all the way back to the green connector at the dash/gauge end. If this is true, and the gauge has both power and ground, then signs point to a bad gauge.
-If you don't stand for something, you'll fall for anything.