Join Date: Sep 2000
Location: Shrewsbury, MA, USA
Could be, it's an 86 ohm resistor (although a 0-100 Ohm Pot set at 91 Ohms works better) that comes with the guage when you buy it, and it does have to be there for the guage to work but all that does is provide the counter EMF to drive the gauge downscale, otherwise the gauge would just go one direction. Something is definately wrong with your wiring if the gauge just sit's in the middle of the scale. It's supposed to be down on the "C" end of the scale with the key on and the engine cold, not in the middle of the scale.
Do you have a ground jumper from the rear metal gauge mounting plate to ground?
Sure you aren't using a temperature switch in the head, instead of a temperature sender? You can't use teflon tape or pipe dope (or have alot of paint) in the threads of the head or sender ir you won't get a good ground connection.
Do you have an Ohm meter? Can you measure any resistance from the center terminal of the sender to ground on the block? If it's open circuited then thats a problem, if you can read somewhere around 300 ohms with a room temperature engine, thats good.
1969 Indy Pace Car
350/300HP RPO Z11
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