Changed the coolant, put in a new horn relay, replaced the front turn signal/parking light/horn wiring harness, changed the rear drive and trans lube.
Now my speedo went dead. It was intermittent- more than normally so, so I tried some carbon conducting grease. I tweaked the pins a little, then put the three pins in, but did NOT fully seat them, instead, pushing them in until I felt resistance. I thought this was a snug fit, also supported by the fact that the plastic support "bridging"- now broken, was at the same "elevation", which would have held the pins out a little. I'll pull it off and reseat to check.
Damn speedometer...