Sidenote: You don't mention what car you intend to mod, but cars made in the last 5-10 years lack totally an "accelerator cable". They have a full drive-by-wire acceleration. The "gas" pedal drives a potentiometer, which in turn is read by the car's ECU.
Don't know if you know that but if you don't you have to do some research on your particular car...
Anyway - modifying a car without the knowledge to do it might get you, or worse - others, injured or killed.