However mine came with the ST452-109 sensor so I think you can use either

ST452-109: 0-5 Bar Absolute Pressure Sensor with Low Freq DSP Interface (0.5% FS Total Error Band over -20C to +80C) Dash-3 Pressure Fitting (e.g. Boost)


ST453: 0-3.5 Bar Absolute Pressure Sensor with Low Freq DSP Interface (1.5% FS Total Error Band over -20C to +80C) 1/8NPT Pressure Fitting (e.g. Boost)



I've got to be honest I've still not got used to the absolute pressure.. very confusing