I was looking at my shattered intrument cluster (yes im considering repairing it, Its only in about 10-20 pieces). Anyway, while I was looking at it I noticed that there is a bit of circuitry in the speedo that appears to switched when speed reaches 20kmph. Does anybody know what this is for? from the outside of the unit it apears four wires going into the instrument cluster on the speedo side. btw its a 3ln1 Any Idea?