Okay, so I transplanted a '90 XJ EFI 4.0L into my '86 MJ, and the instrument cluster doesn't work. So, I replaced the senders for the temp gauge, and the oil pressure gauge, and they now work. What about the voltmeter, the tachometer, and the fuel gauge?
Are there senders in the alternator, and for the tachometer? What are the chances the instrument cluster has gone bad?
Any of you gurus have an idea about this?