Assuming you can get your engine builds running
This is my IC engine test bench.
The bottom flow meters are used for gaseous fuel (propane), the upper airflow meter and manifold can be set up for compressed air.
The switch in the upper left powers the little black box with a knob, that is a pic microprocessor controlled servo driver for the throttle.
The plastic valves on the left allow selection and filling of various liquid fuel sources. Hanging off the top backside is an old lawnmower tank currently filled with E85.
The cut up yardstick and tubing on the right is a homemade manometer, and the metal valve block at the top allows selection of various measuring points.
And for safety, we have a substantial 1/8" steel propeller shroud for working on airplane engines.
I have spent enough time working around a dyno to respect spinning things. The hole in the cinderblock wall where a chunk of mallory came out of a crankshaft was a constant reminder.
There are a million holes in it as it has been constantly reconfigured for different engines. There is even provisions for an airflow sensor to be added.