I actually found that site after I posted, however they do not offer a dyno for sale.

I thought someone would be offering a complete package dyno system for the hobby by now, it's too simple not too.

I'm no electrical engineer, but how hard can it be? You simply need a way to measure output RPM on the shaft, and time. We know through physics how much energy it takes to accelerate any given amount of mass at any given rate with friction variables added, so that is the simplest part of all - to write the formula.

Now write a measily little program to computate horsepower and torque from this formula and presto, we have ourselves an engine dyno.

Even if the dyno was not completely corrective or accurate, you would still have one very useful device by its comparative uses from the curve it outputs. I.E. If hp was wrong, the curve is still completely correct in showing the creation of the power at its given rpm.