Hey there i just bought at hatch and the speedo doesnt work for some reason. Sometimes it just stays at 20, sometimes it goes all the way around forwards/backwards. It just does whatever it wants. I have the si cluster and the tach doesnt work eithr but i have a 5 inch moster tach that works. What should i do. How do i tell if my VSS-vehicle speed sensor is bad. Or do i need a cluster off ebay.