I'm using microtech, as far as I can see there are only 5 loading points are actually useful, from 20Hg to 0Hg, may be I should go TPS as there should be more loading point, something like from 0% to 65% from what I have read from this forum. But I also worry about like you know mountain and sea level have different atmosphere pressure, does it any matter? and, the vacuum at low speed driving is different from when you driving high speed with the same amount of throttle opening position, because wind coming into engine bay??.