my '78 280z will sometimes run the fuel pump when he ignition is in the "on" position, but without then engine running, and sometimes it wont. when it is, then the starter runs very slow and i have no tachometer or dash lights and i cant get the engine to fire, and sometimes it does start, seemingly on random occasions. if i let it run, then shut it off, then try to start it again, it will fail and i have to wait about 2 hours then im back where i originally started. any thoughts? thank you for the input.