If this is the wrong area for this I do apologise as my first post and first quandary. Just swapping a set of clocks over and wanted to keep my speedo mileage as the wiring on mine was pretty damaged. So went on as you do removed screws took my speedo out and attack the better looking one. When speedo removed there's a circuit board on the side that plugs into the rear of the clock 3 pin plug. Anyway when I went to plug the other 2 plugs that are held on the clock bracket I notice the bike has a 6 pin and the new clocks have a 4 pin black plug. Why is this??