The connector that goes to the sensor on the side of the block and runs the engine temp sensor on my 85SD was MIA. I just crimped a generic connector from my box of connectors and guage has been working fine. The wire insulation has become brittle and the next step will be to replace the wiring or that part of the harness depending on what parts can be sourced.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.