you keeping fuel pressure?
tach should be a blue wire on the dizzy i think, idk why it wouldnt work sounds like wiring issues to me (tach and lights). altho the lights are part of the chassis wiring and not knowing how you made the wiring work have a hard time with that, fuse maybe. you need more info than it dies after a min. tho check spark could be an icm going out had a few of them in my day. the heat sink goes bad on em over heat, dead. if thats the case go to the shack and ask for liquid heat sink. trouble shoot start with the easy stuff and work your way from there.