On my 1986 245:
Is the yellow-blue wire from gray box going from ignition to the starter?
Where is the yellow wire in gray box going to and coming from?

I'm about to rewire the alternator's idiot light sender and the oil pressure sensor, and maybe the ignition-starter yellow/blue one while I'm at it. Maybe I can just do all four while I'm at it, if I knew what these other two were doing.

THanks so much