[QUOTE=Bill K.]because typically, CHT is thermocouple and O/T is thermistor -- they work different and would be difficult to connect to the same gauge and have equal temp scales.
QUOTE]
Well at least someone here has some knowlage, yes Bill your correct, as a rule oil temp and water temp gauges use the resistor type sender unit and head and exhaust temps are done via thermocouple and they don't work together very well.
I had assumed that someone wouldn't mix and match sender units, you can make a thermocouple take oil and water readings (very successfully)and make a resistor type sender unit measure head temp.
It would be easier to make a thermocouple measure oil temp than a resistor type sender unit measure head temp, (i think you would have to dril and tap the head to fit the sender)
I have use both of the above to measure temps on industrial machines both fluid temps and component temps, as a rule we would use the thermocouple type probe 95% of the time they easy to use and very versatile.
