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
you just need vr-hall converter and some small adjustments in ecu hardware depending on ecu version
Vr to Hall converter From vemsshop would be a good start