Does the package contain a monitor? If not, please tell me what type of monitor I should buy for P31 camera?
The package doesnt include the monitor, please purchase the monitor/radio with rca/av imput, like DoHonest D35 rear view monitor(ASIN: B0BN41634X).
Can the angle of the backup camera be adjusted?
Yes, you can adjust the camera angle through the three gaskets included in the package.
How do I turn the guide lines on or off?
Cut green wire will close the parking guide lines ( default with guide lines); Cut blue wire will flip the image 180 degrees; Cut the white wire will switch image to facing front view (default is mirror rear view).