At 02:54 PM 4/23/2012, Scott Daniel - Turbovans wrote:
I don't think the reistor method is really right to operate the temp
gauge , seems to me if it's calibrated to be correct at around around
180 degrees ..it might be off at other temps .
To get best use (rather than best aesthetics) from an external resistor, I'd suggest the value that gives you a total (sender plus external resistor) of 35 ohms at the temperature that you want the overheat alarm to go off. That's the calibration value for the overheat threshold of the Vanagon gauge. I don't know the characteristics of the Subaru senders, so I can't tell you exactly what that value is.
The gauge will read differently on the rest of the scale, but it will be correct at the crucial point.
Yours,
David
