Yes std Weber uses 4 on a 4 cyl engine, Autronic prefer to use 2 on a 4 cyl, something to do with it not actually needing as many inputs, but it can use various configurations and does work with 36-1 as my car runs. I was already using all of the small turbo escort pulley's + sensors before i even got the ECU so seemed silly to change them if not required.