check my blog to see how to do it. i put super s dials on mine (1.OL), if they dont work straight away, just splice into the blue wire from the dizzy, and it goes into the back of a plug behind the actual rev dial, i just guestimated, and got it right first time.lol. its third pin from the bottom iirc.
i know yours is facelift, but that is how to do it for prefacelift.