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
cheers mate will do that tomorrow,i gather thats with tach output enabled and disabled on ch0?if i get the readings you posted does that mean i have the pull up resistor fitted?