Thread size for a temp sending unit on a 470 mercruiser

[zlman1970]

Boats got no temp gauge so I'm adding one. Teleflex lists several sending units http://www.teleflexsierra.com/Temperature-Senders/dm/*******.973928231--session_id.034277977--store_id.373--view_id.491522 and I'm wondering if anyone knows which thread size I need. Boats not home or I'd pull the idiot light sending unit and get the threads checked at the hardware store myself.

 

[stonyloam]

Re: Thread size for a temp sending unit on a 470 mercruiser

I guess I don't see any reason the current sensor would not work with a new gauge.

 

[zlman1970]

Re: Thread size for a temp sending unit on a 470 mercruiser

I didn't know if it would display actual temp or if it only opened once its max was reached, turning on the idiot light, you think it'll work huh?

 

[zlman1970]

Re: Thread size for a temp sending unit on a 470 mercruiser

I'm not finding any "kits" and I've never installed a gauge. Do you just run a wire from the sending unit to the gauge and you're good?

 

[Don S]

Re: Thread size for a temp sending unit on a 470 mercruiser

Your idiot light uses a switch, not a gauge sender.
You should be able to install a gauge sender in the engine use the same wire that goes from the switch to the light, and put it on the S terminal of your gauge. The trim sender base is ground. Power to the gauge comes from the I terminal of your ignition switch.