Tachometer question for Boats.net folks

[Stickman]

I have a 1999 SX200TXRX outboard and need a new tach. I have seen a couple of different part numbers.

what is the difference between 6Y5-83500-T9
and 6Y5-83500-T1?

Thanks
Stickman

[Stickman]

Any thoughts - Boats net help!

[Stickman]

Thought i would try one more time.