Question with Transmission temp. guage.

[Maloni]

Im gonna be installing a trans. temp. guage on my 99.5 f-350, i was just wondering if i can use a "add a circuit" and tap into the headlamp fuse instead of taping into the wire behind the headlight switch. Also does the guage need a constant 12v supply and a accessory? or just a accessory?

[ttyR2]

Switched circuit is what you need. Gauges don't need power when the engine is off.

[CSIPSD]

Originally Posted by Maloni

Im gonna be installing a trans. temp. guage on my 99.5 f-350, i was just wondering if i can use a "add a circuit" and tap into the headlamp fuse instead of taping into the wire behind the headlight switch. Also does the guage need a constant 12v supply and a accessory? or just a accessory?

You can use the add a circuit things if you like, however you will not be able to dim the lights. They will be on full bright once you turn your lights on.

Hook the gauges up the way the instructions call, if they call for a constant hot, then you should hook up a constant hot.

Originally Posted by ttyR2

Switched circuit is what you need. Gauges don't need power when the engine is off.

Not correct, some gauges require a constant hot to operate correctly. Get your facts straight before posting, or dont bother.

[Maloni]

Thanks for the replies, yes the guage only requires a switched circuit.

as for the light in the guage the instructions call for the positive to go to the 12 volt light souce, and the negative to a good ground or a dimming circuit.. not to sure what "dimming circuit" means. I would have thought the + from light would go to the dimming wire behind the light switch and the negative to a good ground... sorry if i sound like a tool here guys im just not very knowledgable in this dept.

cheers