Just like I thought thats a stage 3 conversion not 1, turbo is certainly a T34 not a "Group A" what his saying to see check to what markings it has on it.

CTS= Coolant Temperature Sensor this is a thermister that supplies ECU with coolant temperature info hence the name.

ACT= Same sensor in diffrent housing but this measures air temperature instead and is screwed into plenum.

They can go out calibration but never had a problem with mine so never touched.

Martin