2000 monster rear view camera

[whitechocolate781]

I have a rear view cam im trying to setup in place of mirrors. it came as a kit off amazon for like, 90 bucks, anyways, I would like to connect the power to a switched wire, im guessing one of the wires off the ignition, but im not sure which one. there's 2 wires coming off the screen, one says b+, the other says acc. not sure if i need to connect both to a power source or just one. any advice would be great. thanks.