yes, the large (Red) wire from the headlight switch needs to go to the starter (or battery direct). you may be able to get away with feeding the wire through a grommet in the firewall, and crimping an M8 eyelet in place of the original connector. The small blue wire, from the (speedo) generator warning light, should connect to the push on terminal on the alternator. if it doesn't reach, extend it. That's basically it, providing the alternator you are using is the later type with built in regulator, which are mostly used nowadays. (just 2 terminals).
Oh, BTW the pink wires are probably red, but have faded with age!!
good luck.