Both needles on the oil pressure/temp gauge starting fluctuating at the same time from normal readings to very low readings. The sending units and incoming signals were constant (did not fluctuate). I traced the problem to a pair of dirty contact points within the guage itself. I lightly sanded the points and the problem when away. After about a month, however, the problem came back. Has anyone else had this problem and fixed it permanently? Why after 26+ years would the contacts need to be cleaned so often? Is there an underlying problem that I have not uncovered?