Forgot to mention, if after doing what I suggested and gauge works, before you condem the tank sending unit make sure you have a good ground to the tank and sending unit. Ive seen many gauges not work because the ground at the tank unit was faulty.
when more than one or all gauges are dead the common factor is the instrument voltage limiter than supplys their power. Good luck
My gas gauge on my rally dash doesn't work either but there is no limiter on the back of mine... There is what looks like a condenser ,is that it.?? How can mine be checked?
fuel and temp guage are driving me nuts on the duster. intermitent problem. the both zero out out of nowhere. sometimes you tap the cluster and they work but quickley back to zero. they always do it together so i dont think the guages or senders are bad.