Hey mate. I purchased my autometer wideband off eBay about 380 from memory and it came with complete lis of things needed. Bosch sensor was also included which needs to be installed just after the dump pipe. Usually they will drill a hole in the dump weld a bung in (which is a nut basically) and the sensor screws directly in. My local exhaust shop did that part for me when I was getting my new exhaust fitted, it should also be installed at a certain point on the dump. I then got my electricity direcly from the fuse bix located next to the pedals as my gauge needed constant voltage even when the engine was being cranked. Hope this helps.