OlBlue, thanks for responding but is the 55 GMC gauge the same as the 53 chevy in terms of its internal resistance? It seems like they would need to be the same for the 30 ohm resistor to work in the chevy. Also it seems to me that if the resistor is mounted behind the gauge it could be hooked in parallel. That would make the resistor act like a shunt. I thank you again for your info but I'm at a loss as to which way to go.
