The diagram might be in the Clark´s site, but as I told you, the radio can be programmed to just use switches in the radio (which is faster and cooler than moving the sticks in a tamiya tank... BUT a radio can be programmed to do the same with the tamiya electronics!) anyway Im no expert in clark electronics, but many people could guide you here with it. I think the newer versions are more friendly user and come already ready to use with no programming, but again, Im not clark expert or clark fan.

But trust me, you will enjoy aftermarket boards way more than the tamiya ones.