I am in the process in converting my car to an electric drive train. Removing the stock engine / transmission have rendered my digital instrument cluster, as well as electronic power steering, useless. The two primary signals that feed the car's computer are the vehicle speed sensor (VSS) signal and the crank signal. From these signals, the computer calculates the vehicles speed (off of VSS) and the engine's RPM (off of crank signal). The computer also sends both the VSS and engine RPM signal to the electronic steering pump's control box so that power steering works. However, I am not sure how the power steering control box handles the signals - this is why I need to figure out how the signals interact before making a final circuit.
I want to use an arduino, either a mega or an UNO R3, to make both signals at the same time. I know a mechanical relay would not be capable of running the necessary frequencies (0 - 100khz-ish), so how would I do this? Transistors? The engine RPM signal runs off of 0-5v square wave signal, while the VSS runs off of a 0-12v signal. I should also add that the signals will not run at the same frequencies, the VSS may be running at 50khz while the crank signal may be running at 5 khz.
Thanks for the help guys :-)