Temperature sender/sensor & harness

[Soundmound]

Originally Posted by hatzie

Not really a harness. One Green SXL jacket wire from the sensor in the LH cylinder head to the bulkhead plug at the firewall.

If you decide you need some thermal protection you can buy thermal protective wire sleeve.

The sensor has a female Packard 56 terminal. Prior to 1981 the temp sensor could be one of the GM nailhead sensors or a 1/4" disconnect tang so the black plastic Packard 56 plug housing had a slot machined in it to slide over the nailhead or tang sensor connection or the 1/4" tang.
Here's a picture of an AC Delco 5665C repair pigtail with this connector. It's natural vinyl rather than the original black. You can look up the original Delphi Packard plug part number on the GM wiring diagrams.
Attachment 2180349

Nailhead sensor so you can see what I'm talking about...
Attachment 2180350

I saw a previous post you had answered on the same topic in 2018, but couldn't glean enough to self answer my question. As you can see my unit is like a Schrader valve inside.... Oh and it's an '84 Scottsdale 5.0