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
i'm using this valve. Its a MAC valve, and i like it because it has 1/8" NPT ports which allow easy configurationbeyond that, it had a nice PWM range of 15-85%. much wider than the GM valve i used in the past.http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=330480946244