I have a 40hp outboard on my 20ft pontoon and it has no gauges at all. I do need a tach and was wondering about the need for a tilt/trim gauge. Are they needed on pontoons as much as boats? Is the sender for the tilt/trim in the motor or do I have to install it? And does anyone have a wire schematic for a tach hookup? Any recommendations on where to get the items mentioned? Thanks!!