Experienced odometer failure the other day after resetting trip meter. On occaision after that it would work intermittently. I took out speedo unit and found crumbled 12 tooth drive gear. I ordered a new one and installed it and it registered 2/10ths of a mile and quit again and now does not work at all. Speedo works fine but odo and trip meters do nothing. I took unit out again and all gears look fine. Does any one know what each of the connections on the back of the speedo unit do? There is a multi pin plug and a large single pin connector.

Everything worked fine until I reset the trip meter that initially started the problem - all I have done is replaced a broken gear. Any Help would be appreciated. Thanks, Tom