With a fresh battery, you should be above 14v when the engine is running. When I look back in logs, the voltage is around 14.3 - 14.4v. (Bandit generator)
Yes, you can buy a connector kit
https://bjprace.se/el-och-elektronik/kontakter/4-polig/elkontakt-vag-tandspole-losa-stift/
Do not think you get new genuine Bosch 0 986 221 023 for 22 quid
Fit a wheel to the crankshaft. Use a TDC tool. You need to rev it proper too see that the timing do what you want
M14 1,25 buy a long car wheel bolt and a peace of tube. make a hole in a spare cover