I have a 1983?? merc 70hp outboard ser no 6323758 model no 1070623. This motor has the "A" style trim cylinders with the pump mounted in the boat. There is a trim limit switch on the port cylinder (I think this is supposed to be on the starboard) but that is the only switch I can find. Is there a trim sender available for this unit? I am laying out the guages in the dash of a wooden boat under construction and I need to know if I can use a trim guage. I would like to if at all possible especially since a have a guage already.