going off on a tangent, tune ecu is a bit confusing when it comes to throttle pressure readings.
since we're reading from a MAP sensor i.e. absolute pressure, the gauges should be reading about 1000hpa when the bike is not running.
and then when it is idling, the needles should be down around the 400hpa mark. when you rev it up, the needles would climb closer to 1000 mark. if you had a turbo or supercharger, as you rev it up more the needle would go past the 1000hpa mark and hit say 2000hpa if you were running 1 bar boost (and the scale went that far, of course).
however. tune ecu readings start at 0, when bike is not running, which means that the readings shown are 'gauge' readings i.e. not absolute.
when you idle the engine the needles float about 600hpa (should be -600hpa if we are on the gauge and not absolute scale), and as you rev it up they get closer to 0.
having that - in front of the numbers would correct the readings to actual throttle pressure readings (on the gauge scale tune ECU uses), but the readings would not be raw readings as raw readings would be on the absolute scale.
tune ecu must do some simple maths to change the reading from 400hpa (absolute pressure at idle) to display the 600hpa. but of course it should be -600hpa to be correct.
i understand nobody cares what the numbers are, as long as they are the same (why triumph's official gizmo for throttle balancing just says "they're grand" and don't give any numbers), but having gone this far with tune ecu why not have it absolutely (pun intended) correct
/end rant