I'll throw in my 2 cents as well...

Almost everyone I know has a 4-stroke and none of us use a tach.

Mount it in your plane, hook it up (Tank, throttle, etc)

If it did not come with a glow plug, make SURE you are using a 4-stroke plug

Close the needle and open it about 2 turns.

Prime the carb - 4-strokes like to start wet.

Then adjust it exactly as you would a 2-stroke.