When asking for technical help at the very least let us know the version of firmware you are running.Cliff's Calibration (Mapping) Guide is a MUST READ: http://www.vemssupport.com/forum/index.php/topic,97.0.html
hiya,I am using the 250kpa version.i currently have 31.75kpa in the offset,
cheers everyone,Problem solved, changed map sensor to 400kpa and offset to 2kpa in vemstune.now readings are correct at 99kpa, and 10psi reads 168kpa....much happier now and moving onwards.scott
Press F1 for help in the MAP calibration dialog for good starting values for the 'range'. Calibrate the offset according to local atmospheric pressure.
GintsK : The range value is what it is, your range calibration is above most peoples knowledge/skill.