why is my map reading backwards?????

my map sensor is reading 100kpa when the engine is off/ignition on. and 0 when its running.

lololol

any clues why its doing this? wiring is:
C- 5V
B - signal
A - low ref

map sensor part number: 16249939

I think it has something to do with me selecting 1bar speed density from the OS menu and reflashing... I switched the +5v and ground on the sensor for a lol, but all it yielded was a non responding gauge.

so weird. its not just the gauge on scanner, also when in real-time the table reads the same value as the gauge. i.e. the selected cell moves higher in vacuum as the engine is about to die.

what have I done? and how do I un-done it?

that seams mostly normal to me... at least the 100kpa with key on and engine not running as atmospheric pressure is 101.325kpa at sea level. http://www.princeton.edu/~achaney/tm..._pressure.html

Although reading 0kpa at idle would not be right. depending on the engine and altitude, baro, temp, ect ect... 30-35kpa should be about normal idle vacuum.