ORIGINAL: Boomerang1
...a remote needle mounted next to the engine with it's axis along the model. The remote needle had a very long extension through a tube to the cockpit area so the engine could be tuned by twiddling one of the scale knobs in the cockpit.
I'm not sure I understand how such a "remote needle" would work. I can picture the idea of a long L shaped extension that one moves up and down to "remotely" turn the needle valve -- a sort of long lever. Is this what you mean?
BTW, I'd also like to include hidden/remote access to the idle set screw (which on the Saito is located in the center of the throttle arm on the opposite side of the needle valve).