Im trying to set up the arduino kina like a car ecu so that when the key is in and on, the bike goes and the lights come on
Doesn't it do that now? I'm all for doing projects and learning and hacking stuff but when it comes to vehicles that will be operated in traffic I have concerns.
I don't know for sure, but I have my doubts that a vehicle's engine management computer also handles the signal lights. I could see an ancillary computer doing this.
A possibility I see is using the arduino to detect signal light (and even brake light) operation and log that. You'll still log that info without adding the overhead of actually operating the lights or compromising the safety and reliability of an already functioning system.