Proform Shift Light

I bought a Proform shift light off of Ebay last week($25 ended xmas eve night). I hooked it up and am having a problem with it. It is a stand alone shift light, No tach needed. Only 3 wires to hook up, positive wire, ground wire, and a wire to the negative side of the leading coil. When I set the dial to around 1000RPM it doesn't come on until about 7000RPM. Like it isn't getting enough signal. You jump 2 different wires depnding on if it is 4,6,or8cylinders. (Now as I am writing this I am wondering if I could jump it as a 6 or 8cylinder and get a closer reading) Any experience with these?

If the light is for a car, the light will come on at twice the RPMs it's set for. That's because a car has a distributor instead of using two coils. A 4-cyl car-coil fires twice per crank revolution, the 4-cyl bike-coil fires once per crank revolution.
If you set it to 1000, it should light up at 2000 (in 4cyl mode). In 6-cyl mode, it will light up at 3000. In 8-cyl mode, it will light up at 4000.

Why at 7000? Not sure. Maybe hook it up to the other coil and see what happens.

Post edited by: loudhvx, at: 2006/12/29 00:22

I jumped it as a 8cy and it brought it to within 1000RPM of what I set it and where the tach reads. Thanks