Try doing a reset on the perfect pass module. Otherwise you may need to contact perfect pass and get a new display. PP has pretty good customer service and will help you Troubleshoot your issues.
Resetting a Wakeboard Pro
Version 6.3/6.4/ 6.5
You can do a System Reset by pressing and holding the ON/OFF & MENU Keys together as you turn key on to power system. Continue holding as the Perfect Pass display goes through its normal start up procedure until [System Reset ^ = Yes] appears.
Press the UP key to continue the reset. It will then display [Reset RPM @ ^ = Yes]. Answer yes by pressing the UP key. Next on the display will be [Read in MPH ^ = Yes]. Answer yes by pressing the UP key. Next [Wakeboard Only ^ = Yes] will appear. Answer yes, by pressing the UP key. For WakeboardPro, press Down for DigitalPro. http://www.perfectpass.com/troubleshooting/ServiceManual.CorrectCraft2005.pdf make sure you record your kdw and nn settings if they have been changed from factory, i beleive these get reset when you do the system reset!
(Message edited by gmarkham1 on April 21, 2009)