Something to consider.....the Autometer C2 gauges and others made by them often won't register if there is low voltage. That's per Autometer techs. Some time back I changed out my oil pressure gauge due to it not working, turned out the new one was erratic so I called. Low voltage at start up due to an old battery using all its juice for starting caused the problem. Recently my oil and temp gauges started to do it again so I figured I'd put the charger on it over night and see how it worked. Same problem....so took off down the street and with high rpm I cut the ignition and turned it back on. Bingo...I had gauges. So, thinking my battery was only about 3 yrs. old I checked the maint. record and whoops....it was just past 5 yrs. old last month. So, out with the old, in with the new, and I have active gauges every time.
Thank you, John. I hadn't considered an aging battery. Like your's, mine is old enough that I can't remember exactly when I last replaced it. Perhaps it's time. Terry