Basically, to set the governor: Move the carburetor throttle butterfly to full open and verify which direction the governor shaft rotates when you do that. Then loosen the pinch bolt while still holding the throttle butterfly wide open. Rotate the governor shaft the same direction noted earlier until it stops. Once it stops, tighten the pinch bolt and let loose of the throttle. Fire it up and the governor is now adjusted. If the engine tries to accelerate way too high shut it down and recheck the directions and what you have adjusted.
Like I mentioned earlier the top speed is normally set at 3600 RPM, so you may have to bend the governor spring tab to reach that with the throttle cable, lever set at high without hitting the choke operation. Some governor arms have extra holes, so the spring may need to be connected to a lower hole on the governor arm.
Main jet screw on the bottom of the bowl may need some minor adjustment. Out is rich and in is lean.
Once your high speed is adjusted, then work on getting the idle correct. There is a separate mixture screw for idle as well and it adjusts the same, out is richer and in is leaner.
Basic starting adjustment for both mixture screws is 1-1/2 turns from light seated (closed).
Once you get it running, run it for 30 minutes on full throttle, then shut it down and pull the spark plug to check the color of the electrode. It should show a very light tan on the porcelain. White is too lean, dry/black is too rich for the mixture.
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I use the same old school Briggs vibration tachometer as you mentioned, I've had it for 40 years and they work great.
