I have battled for a month with no spark at the front cylinder and have to ask for help. I have an 86 with a sealed MF Yuasa, & iridium plugs. I have tested pickups, pickup connections, I.C. igniter, front ignition coil (not just resistance but with a coil tester), spark plug wires and caps are good per manual specs. All grounds cleaned, all connections cleaned and greased properly. I have read threads about this until my eyes want to jump out of my skull. This started a month ago when I went to start her and she cranked and cranked then the tachometer went dead (although the temp sensor and bulbs work), then she started on the rear cylinder only. At this point it is down to the possible short in the tachometer I have read about. Does anyone have any advice as to what I may be missing? Or how to test for this short in the tachometer? I tried to start it with the tachometer disconnected and got the same result-rear fire only. Thanks in advance to any and all!