[Jac Mac]

You cannot measure HP without knowing what Torque you have first.

Lets say for some crazy reason you decide you need 800 HP @ 7000rpm.
To obtain that you simply just keep developing the combination until you have
600 ft/lb of torque @ 7000rpm, you only get torque readings from the dyno, the HP is simply a calculation from that reading in conjunction with RPM with allowances for Temp-Humidity etc.

BHP = [(RPM x Torque) divided by 5250]

Torque= [(BHP x 5250) divided by RPM]

Jac Mac