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Ummm it should be the other way around. You can't get a HP number without a tach signal.
Horsepower = (Torque x RPM)/5252
Torque is meadured on the dyno as the force exerted on the dyno drum and the radius of the drum, using the acceleration rate of the drum I believe. There's other ways of measuring it but typically a dyno will measure the torque and use the RPM signal to figure out the horsepower.
For a tach signal I think that we may have used a spark plug wire. I'm not exactly sure since it was quite a while ago.
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