Working on the Valve cover, found a mystery wire - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Longhorn Man · 10-04-2005, 02:58 PM

None of these trucks ever came with 2 sending units. Not originally anyways. The only original location for the temp sending unit for a small block 67 - 72 truck is in the passenger side head between #1 and #3 cylinder exhaust ports.
This may be for the vacume advance delay crap that they had as primitive emissions... Not sure since I have very few details, I think that was mounted on the passenger side of the intake with a relay or something on the firewall.

10-04-2005, 02:58 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	None of these trucks ever came with 2 sending units. Not originally anyways. The only original location for the temp sending unit for a small block 67 - 72 truck is in the passenger side head between #1 and #3 cylinder exhaust ports. This may be for the vacume advance delay crap that they had as primitive emissions... Not sure since I have very few details, I think that was mounted on the passenger side of the intake with a relay or something on the firewall.



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