installing a speedometer on a 1984 trx 200
 

I bought this hondaline speedometer that is supposed to fit my 1984 trx 200. I purchased it form ebay, but it came wtih no instructions. It's a electronic speedometer not cable, it has 2 main wires splitting from the box. 6 plug-in type wires on 0ne and a plastic plug on the other . any suggestions would help.