punisher

Punisher22, Audi A4 2.5 TDI 7 speed Mutitronic. Hi, I have had an aftermarket Radio/cd/dvd/mp3/7" screen/reversing camera professionally fitted, but now I am having electrical gremlins on my dashboard car display, sometimes the auto gearbox display lights up totally instead of just the gear I have selected, the engine management light started to flash indicating a problem, the bulb indicator comes on when the reversing camera is on telling me there is a problem with the number plate light, but all of these stop when I put the radio on, has anyone else suffered from this with an aftermarket radio, the reversing camera has two LED bulbs fitted to illuminate the number plate, many thanks for any help offered.