My fuel, amp, and oil gauges don't work. The only guage I am concerned about is the fuel guage as I have replaced the other gauges with aftermarket ones. The fuel guage was reading about one quarter above the actual fuel level now it is stuck on full. I am not sure how to remove the cluster from the dash in order to check it out or should I check the sending unit first(don't know how to do that either. Thank you very much.