I honestly think neither gauges are needed if you're getting a reputable tuner to tune it on Ecutek.
AFR failsafes along with boost failsafe will negate the need for any gauges except for oil pressure ofc.
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning
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