1999 Dodge Caravan Taq sensors

Electrical problem
1999 Dodge Caravan Front Wheel Drive Automatic 179048 miles

Over the coarse of the last year, I have been having issues with my temperature, speedometer, odometer and fuel gauges flat lining at random while I am driving. Sometimes goes months with no problem to weeks. I estimate that it had happened 15 times in the course of the year. Sometimes they come back on there own only seconds after failing, other times I have to hit the top of the dash to get them back. We checked fuses and brother-in-law checked ground. Is there something else we can check. Kind of hard to check when it doesn't happen all the time and very seldom happens when I get it home.