1966 Plymouth Barracuda Formula S - Restoration

So, I got the carb back in. It's a lot more responsive, but still runs like ****. I'm going to have to retune the carb with a vacuum gauge and a timing light and re-check the timing. It drives, but hesitates some. I haven't bothered to do more than do a rough adjustment on the idle air screws using a vacuum gauge.

The clutch pedal is still really sticky - I've been having to pull it back off the floor. It's also engaging/disengaging across the full travel. The previous owner said it needed a clutch, but I'm not convinced yet. I don't know if the return spring is trash or what - I'll get to that eventually. I'm OCD enough that I like to try to fix things in a certain order - first, electrical, then engine, clutch/trans, brakes, suspension, tires. I'm still early in the electrical stages at this point.

I repainted all of the gauge needles this weekend - and found that the gas gauge is also completely inop. The temp and oil pressure gauges are functioning. The tach is also seemingly dead. I plan to replace the ignition with a HEI setup at some point, so I bit the bullet and got a replacement tach (8k rpm, no pancake sender needed) from Vans. I'm not super pleased with their customer service - ordered, called 5 days later after no shipping notice and got told "oh, sorry, we ordered it but it hasn't gotten here yet, i'm sorry nobody called you - it wasn't in stock but the website said it was". It's not essential, but I probably won't buy from Vans again unless I have to. They claimed it was 'on the way' to them, but I suspect it's not and that it's just backordered from whoever is making them.

On the gas gauge, I pulled the face back a bit and can see one of the nichrome wires just dangling. I thought I could just disable the non-functioning voltage regulator, but the gauge is also inop. I bought a semi-cheap 66 valiant gas gauge on ebay and plan to just swap faces, now that I'm running the external limiter. I'm starting to suspect there are some bulkhead wiring issues. The temp/oil gauges still aren't really moving much, with the IVR working. The other suspect piece about the bulkhead connectors is that it's only intermittently wanting to start when I release the key from the 'start' position, like the coil isn't getting power when it's cranking. After I fix all of the lighting issues, that's next on the list. It's probably the bulkhead connector or the ignition switch - time will tell.

Does anyone have sources on places to buy pins for the instrument gauge wiring? The female side on the gas guage on mine has been replaced with a lug, probably because of a broken pin. Also, any ideas on the single contact tail light housing? The pin/wire are broken and it's not repairable. I'll probably just get a universal push in socket replacement, but it's worth asking.