any suggestions please its going onto a eclipse 6620 also im looking to find a way to use external rotary volume knob with the 6620 thanks guys
True. I have one of the adapters that allows you to use any camera. You can have it for the cost of shipping.The Eclipse one is good but has a bit of a fisheye effect. The one I use is a Boyo plate cam. For the price it is great and does not require any drilling of holes in the car, other then getting the wire to the radio.
Your biggest problem is finding someone that can hook the camera up for you cause Eclipse uses a 4-pin plug for the camera instead of a RCA connection. Eclipses' camera is also 6-volt.