As promised, a picture of the crimper (got it from KTA). WONDERFUL tool. I wish I had it when I started.
I also installed two ammeters – one for the battery and one for the DC-DC converter. This shows me that both are working as promised, so my right-turn indicator problem is due to the older car wiring.
I’ve been busy – this is a circuit that will drive the porsche 914 gas gauge from a 0-5v signal (from the BMS). I spent a few hours getting the resistors dialed in, but it works on the breadboard – now I just need to solder up a circuit board to do the same thing.