Iam having some problems with my machine . It does not have a active needle or it is not registering any type of Miles, trip or hours. the machine will go in reverse but will not show on readout. It will however show N and H. Also it will not go in 4x4 in reverse override. i was told it is most likely a speedo unit., which is 255.00. Where is the speedo unit, is it the unit on the headlight pod or is it some place else. other question is can i use a friends head light pod with his guage assembly to test mine.?