2001 GTX DI speedometer suddenly quit. Both the digital and needle gauge stopped working at same time. Everything else works fine including Tach. Paddle wheel is in tact and spins freely, cable seems fine, magnetic pickup looks fine. Any suggestions on a repair appreciated. However, being new to all this, I wonder if anyone makes a drop in replacement GPS speedometer? Where I can just remove the speedometer gauge and drop in a GPS speedometer? Thanks!