You are right, I did get the posts mixed up. As for the shifter, it works perfectly, I drove the motorhome again yesterday.
The difficulty may be in the installation. You have to install 2 relays to take the place of the neutral safety switch in my application, plus find a power source that is constant during engine cranking. The servo is also a computer that must have constant voltage to function, since it controls the start relay. Newer RVs may be wired different, and different shifter units are available from dealers. Google PCS shifters for more information.