How far to rev this 273 commando build

RichB said

HP is not just a function of torque . It a a function of torque and speed (rpm).
A steam engine can produce full torque immediately (0 rpm). 0 hp.
There is nothing magical about 5252, its just a number that results because of the units of measurement that are used. There is no way to calculate hp directly from torque.
Of course a dyno measures horsepower. It measures torque and rpm at every point in time and reads out horsepower and torque.
Doesn't an ammeter measure amps? It actually measures a voltage drop across a resistance.

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You are playing with words. If you are going to say that a dyno measures torque and rpm, the answer is THE DYNO CALCULATES HP from those two measurements. Torque can be measured DIRECTLY. It's called foot and pounds, IE length of the arm or linear measurement of a weight over distance

The point is that there is no basic singular device which can measure HP as such.

and yeh. Some ammeters measure amperage directly. Not all ammeters have a shunt and a meter. A moving vane meter pretty much measures the strength of a magnetic field through the conductor in the meter. A hot wire meter is another The wire changes with heat cause by current. A basic d'Arsonval meter........the basic meter, not with added external multipliers or shunts........also measures current due directly to magnetic action. It could be argued that a gigantic d'Arsonval movement could be constructed that would measure substantial current directly with no shunt.