Have a 71 XS650 rephased to 277 and using a Pandemonium ignition with 2 "green monster" single coils and am trying to find out what tach would work with this setup? Have searched through various forums,used search bar and can't seem to find a definitive answer.....From what I understand this ignition is a "waste spark" type which is making finding a compatible tach quite confusing...Any info/suggestions would be greatly appreciated.