have a FAST air and fuel which i planned to sort out last year and because of minor issues , smash and engine big end didn't get around to sorting out.
it's a second hand unit and have not tried to run in the car . I was tying to test the O2 sensor and have watched a few videos on you may tube and have tried this method but no luck with the readings. this involves heating the o2 sensor and then reading the DC current .
if there any other way to test this - the car is not running at the moment but need to sort with the new motor to tune and check A/F