Ok more ignorance coming on, So I decide to buy the one from Eddie Marine and get it installed how do I really know what the numbers mean? What I guess I am saying is do I start at parallel to the ground?
U can adjust it , by sliding it back or forth on the ram...this is how :
U bolt it on and set everything up ( hook it up ), leave it loose enough to slide but not to loose...
then u set your drive level with the bottom of the hull ( straight edge / long straight 2X4 ), make shure the prop shaft is level with the hull bottom.....
Then slide it to where it reads 0 on your indicator pannel ( if u have one that is -3/0/+7 ), slide it to it reads 3 ( if u have one that is 0-9 ) !!!!!
Then thighten it up to the ram !!!!!!
Instaling cable, massure the length of cable needet..from back of the drive ram, to the spot on your dash where u want the pannel and of coarse inside the boat where u actually route it along ...give it a foot more for bends...to long ( is ok ) to short ( will not work ) ......
Then buy a cable thru hull fitting ...( the ones with the ruber gasket inside are the best ).....drill a hole just as big as the cable in to the transom ( if not already one in it ) , drill in a angle up from outside in ..... make shure the hole is at the spot over the ram where the indicator mounts on ( aslo ..ABOVE WATER LINE )...
See picture !!!!!!
( on one of them u see the pannel )
Hope this helps ?!