Accellerator Sensor/Pedal Where do i find one how to replace

[dexy2008]

So, took the unit off and unplugged it, gave it a thorough clean with CRC contact cleaner, put it back together and plugged back in and test drive, Now i need to push down 10mm or so before the throttle engages?!! argh! and my cruise control will not work now, and to top it all off after test run turned car off, went inside for an hour went back out and started the car now the engine light is on permantley which makes me think that there has been a fault recorded which i guess could be a good thing as it may tell me whats wrong, now it will need to go to Nissan Tweed Heads as they can plug it in and check it, me thinks the whole accelerator unit will need to be replaced, Nizzbits came back with $440 for the unit, can another mechanic with a scan gauge check the codes? and also clear them? 3 weeks out from xmas trip and counting!!