I have an aftermarket gauge, that i am wanting to make read 1/3 lower . I
got a water temp gauge, and I am using it as a oil temp gauge. I would
like for it to read a little lower, the upper end of the gauge the number
are low, so the gauge almost pegs out.

Do you install a resistor in line with sensor, what size resistor would it
take.

Hope someone has a clue on this ......