Is this a model, or full size? What sort of actuator are you planning? Steering is one of those areas of a real vehicle which would be considered safety-critical and not a good area for casual DIY systems, and I'd also be concerned that the latency of a steer-by-wire system would make the solution very difficult to drive. On a model that might not be a concern (an RC model is steer-by-wire anyway) but you wouldn't typically have a steering input control with a full revolution.