400hp944

My voltage gauge is stuck in this position, key on or off doesn't matter. The gauge set is aftermarket (SpeedHut), so I have no idea if this problem is related to that or not. I plan to put stock gauges back in it, but that's another project down the road.
My question is: if a wire is disconnected somewhere, would the gauge drop to zero or stay in a particular position? It would help to know this as I try and track down the problem. Thanks!