Instead of using a brake/shift cable/lever off a bike you could get a cheap servo from a hobby store.

That allows you to control it electronically, which gives you the opportunity to do all sorts of cool things like connect safety relays (shut down if RPM is above certain range), route the controls to anywhere in the car, or hell, even get a cheap remote control system (simple wireless switch from pep boys) and control it from a distance far away.

Just an idea.. I'll be doing that for a friend of mine who is going to run an inverter, that'll allow him to remote start the vehicle, then adjust the RPM via a seperate remote to whatever he needs.

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