If this is for the '99 then you need the little black box. We got em at the shop. I can post supplier info so you can order one for your speedo. Since you tranny doesn't have speedo gears you need one of those things.
The black box has a bunch of dip switches to set up multipliers or division factors for pulse counts. Pretty easy to set up and it can be reset for different combos whenever you like.
Mike
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