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Constant Voltage Regulator should be mounted to back of Guages
Temp Guage should have Black / Green wire to one side (constant regulator)Red / White to other side (sender)
The Temp Guage has the same Black / Green wire that goes to the Gas Guage
The other side of the Constant Regulator has a Black / Green that goes to the Oil Pressure & Light Switch (power) & also Circuit Breaker.