I have a sneaking suspicion about the AC on this car. The battery splash panel has three original looking relays (horn, alternator, and AC) but the AC system is clearly aftermarket. I suspect somewhere in the last 51 years, the car may have been built with factory AC, then had it torn out for some reason, then replaced by an aftermarket system.
I suspect this because of the relays, and the spaghetti wiring that I am fixing as I find it. There does seem to be hints of factory air here and there, but the presence of the aftermarket system has masked it until now.
Another reason I suspect the car had factory air is that as I understand it, the ignition key switch was mounted on the AC control panel. In my car from day one, the key was held by a home made bracket that was loosely bolted to the steering column. From this forum, I found out that for Series 1.5 and early Series 2 cars without factory air. the switch was held on a figure 8 style bracket that was attached to the steering column.
Searching for that part was inconclusive @NaplesGuy showed me his and that it was a nightmare to find. Luckily after several months I found one in the UK but I wasn’t able to convince the seller in the UK to sell me the one part he had, but it turns out he’s a fabricator and after getting so many requests for the part in both the US and the UK, he decided to fabricate them himself. I managed to make a trade with him for a part he needed for measurements to send me his first one. The are due to be back from powdercoating this week and I hope to install it over the next couple of weeks, once I receive it.