I'm trying to find some information on the operation of a OMC shifter. Can't find a model number on it. It has a tilt/trim switch, high idle lever, key switch with push choke, emergency shut off tether, and a alarm built into it. Also has a single post plug in which runs up to a trim gauge on dash. Just above this plug on backside of box there is a adjustment screw of some type, I've adjusted it both ccw and cw and don't notice any operational difference. Anyone know what this is for, also I can't figure how to set high idle. Thought you started motor, lifted lever then could adjust throttle lever position, mine doesn't respond to this. Thanks, Todd :?: