73-87 Chevy _ GMC Trucks > Instrumentation

Temp Sending - I6 250 --> 350 SBC

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BitterrootC10:
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?

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

BitterrootC10:
I've got an actual temp gauge in my dash.

VileZambonie:
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.

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