Also, just found this option...
https://www.craftsmanmarine.com/propulsion/mechanical-engine-remote-controls/dual-station-unit/
Multiple Station Installations
Dual- or multiple-station applications almost always use single-function two-lever controls. There are two basic systems recommended for multiple station installations. The choice is dictated by the sum of the degrees of bend in the cables. The fewer the bends, the more efficient the cable action. The control system that gives the fewest degrees of bend should be chosen.
The parallel control system is used when cable runs are relatively short and direct. It consists of cables from each control station running all the way to the clutch and throttle at the engine. An option with this system, for use when cable runs are long, difficult or would be too costly, is to run cables from the both controls to a transfer unit. Then single cables can be run from the transfer unit to the engine.
The recommended method, the series control system, runs cables from the upper station to the lower station controls. Then a second set of controls runs from the lower station controls to the engine.
Understanding Mechanical Advantage
Because you are using a lever to create motion at the other end of the control system (the throttle or shift mechanism on the engine), it requires less effort than if you were pushing directly on the engine's throttle or shift mechanism. Understanding the control's mechanical advantage and the amount of force needed at the engine is very important when specifying the correct control.
For example, if an engine requires 15lb. of force to move the shift lever, and you are using a control with a mechanical advantage of 2.5, you divide the force by the mechanical advantage to determine how much force must be exerted at the control lever to create the needed 15lb. of force.
15lb. / 2.5 mech. adv. = 6lb. of force required at the lever
, again I appreciate your feedback but these comments you feel the need to insert, what's the point? 
