mercury mariner controlbox question

[arkamelis]

hi
im about to set up a trim gauge, i have a mercury mariner control box with tilt and trim. from the control box you have a 8 pin loom to engine, a five pin half circle to the rev counter with a separate black and brown also. then i have four separate wires coming from control box colours as followed light blue,lightish blue/green ( i do know these two to be for trim ) but why have some here when its already set up, then a red wire and brown wire.

the gauge its self has terminals I , S , ground & live plus

any help would be appriciated

[Ian Sharlot]

To fit trim gauge.
Purple = I
Black = Ground
Both of the above are often taken on a piggy back from the rev gauge
Brown with white tracer = S

[arkamelis]

cheers Ian thanks for getting intouch and thanks for info.

ark