is there anyway to test the vss,,,my speedo is not working,,,once in a great while it will jump up to 20 mph and then back to zero,,,my cruise also does not work,,i am guessing because of the speedo,,,,,,i checked and cleaned all wires at the vss and the gauge cluster,,,,can it be the speedometer itself,,is there any way to test that,,,,,any suggestions would be great,,,i do not want to spend over $200 for a new vss and that not be the problem