help!

I've recently fitted an Amp to run my 6x9's (just an old cheap one kindly donated by my step-brother) this is it: but since doing it, when the H/U volume is turned down or on low i get strange noises through my speakers. 1. A noise from the fuel pump priming on ignition 2. A horrid...

Location: Newport South Wales Since removing and refitting the dash board, the indicators, horn and central display have all stopped working. They are the ONLY thing stopping my car getting on the road because without them they will not pass an MOT! I desperately need somebody to help me out...