When I hold the button on the dash in that changes my odometer, when I turn the key to on it lights all the lights on the dash up and runs through 4 numbers, One is the hours but I cant figure out what the others are. one says S-81.4 the next C-61.6 and the last has two lines next to the numbers 42.3. What are these numbers. Is this the way to check for codes also. Thank yall for any help.