One other thing to consider if your running this engine or about to. Change the battery! Very important with a PS-1 which appears to be what you have if the old white battery is still in there I wouldn’t put any voltage to it until you change it to an MTH green battery. Even though it is a conventional engine it still has a board that you can damage usually beyond repair if you have a weak battery. This is the one MTH has in stock now. 50-1008.
Old battery