Hi,It operates on a PWM circuit at 1 Amp from what I have read.
Is this for a transmission swap into a different vehicle? From my experience there is a strategy to the PWM lockups. It will start at roughly a 50% duty cycle and increase to 100% (full lockup). You may want to look into that strategy to avoid burning it up. The Arduino has a 5V output which should work, but I don't think it is going to handle the amp draw of the solenoid. I am assuming your 3 inputs are going to be throttle position, manifold pressure, rpm, maybe even vehicle speed? My advice would be to separate each of those inputs and get one to work at a time then add them one at a time. Use an LED to simulate the lockup solenoid this way you can observe the behavior. I don't have a strong code background, I am new to this myself. I do however have a strong automotive background so I can help you on that end.