Low air pressure gauge faulty

My rear air pressure gauge is going crazy. I have a 2015 vnl760 and through out the day and night my pressure gauge will drop to 0 then back to normal. The alarm is driving me nuts. So I have no air leaks, checked and double checked. Pulled dash apart and looked for shorts or loose wires...nothing.
If I punch the bottom right of the instrument cluster the gauge will go back to normal, same if I bang real hard on top of dash. All the signs of a short, but I wonder if it's the actual gauge itself. After looking at it it's not something you can replace...I think. Would I have to replace to whole instrument panel?? Has anyone else experienced this problem?? Any help would be appreciated...Thanks