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73-87 Chevy _ GMC Trucks => Interior & Equipment => Instrumentation => Topic started by: BitterrootC10 on February 11, 2022, 03:49:59 pm

Title: Temp Sending - I6 250 --> 350 SBC
Post by: BitterrootC10 on February 11, 2022, 03:49:59 pm

I pulled the inline 6 250 out of my 76' last week, and I'm getting ready to swap a 350 in there. The 250 had two temp units and I'm curious which one, or both I need to hook up to get the temp gauge working. Here's a pic showing the two temp sending units circled in red.

Curious, why would it have 2 temp units to begin with?

Title: Re: Temp Sending - I6 250 --> 350 SBC
Post by: bd on February 11, 2022, 04:06:18 pm

Does the truck with the 6-cylinder have a temperature gauge or an over-temperature idiot light?

Title: Re: Temp Sending - I6 250 --> 350 SBC
Post by: BitterrootC10 on February 13, 2022, 12:52:19 pm

I've got an actual temp gauge in my dash.

Title: Re: Temp Sending - I6 250 --> 350 SBC
Post by: VileZambonie on February 13, 2022, 02:02:39 pm

The one near the thermostat housing is the input for the gauge. The one in the head should be a switch. You can verify using an ohm meter. the front one should have a resistance value while the other should read infinite.