Take a photo of the dizzy with cap on and off - it should either be a Lucas, FoMoCo or Bosch.

I wouldn't get too hung up on wire gauge - I'd use anything. There is a discussion here where they suggest16ga


"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10