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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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