I disconnected all three cameras from the box and took the box out, then added a 9 inch screen with multiple camera inputs to the dash that allowed me to display all 3 camera views all the time. Now the rear view displays across the top half of the screen, and the left and right cameras split the bottom half. I love it, and the in-dash radio screen no longer is involved.
Screen, $70 from Amazon, is podofo 9" TFT LCD Split Screen Quad Monitor.
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