Hey guys. I just recently bought a Nissan 1991 pathfinder/pickup BD25 diesel. All the gauges in the cluster work aside from the tach, do you have any ideas where the tach signal is connected to? Is it connected to the alternator or somewhere else? The tach is connected by a 4 pin socket, I've already tested it with a test light and it seemed like there is power with one wire, i guess its from the ignition key but the other two are not sending any signal. Any ideas? thanks in advance.