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I haven't done one in awhile but a road dynamometer will give you the horsepower and rpm curve for an engine and is accurate to 2%.
You need a tachometer and speedometer and in the "olden days," a stopwatch and either someone to write data down or a tape recorder. Today you could use your cell phone to record a video of the tach & speedo.
Obviously you need the car's weight too.
It's nothing more than an acceleration plot of time against "in gear" mph achieved...... and some math.
A running vehicle would also be required....