If you seen the fcd tapped into the harness remove the fcd completely and re join the wires it was tapped into should be colour coded so should go smoothly. There's some good deals for the e manage blue including install and would give you a good safe map for what your looking for.have you got a rrfpr or a wideband gauge installed. U can switch the fcd of by turning it to number 12 someone else will be able to confirm