What's up with all the spaghetti wires you have coming out of it? When was the last time you used it? Is it able to run off batteries?
Previous owner wired it up using vampire taps (RPM/Water Temp/etc). It has an internal rechargeable battery so I'm not sure if you can run it off another battery. You can view the manual in the below link. Last time it was used was probably this time last year. I parted the bike shortly after that as it was a "B" bike and I would yank parts off of it. http://www.xtracing.com/data/manual_gpxpro_2010.pdf
I run this same timer... all the wires allow for getting data logs from bike... speed, rpm, gear, water temp, etc... I have mine tapped into the headlight harness for power and grounded to battery. (My internal battery doesn't hold a charge long) Ps This is a great timer and fairly accurate... my last race my timer said I did a 1:13.01 And the tracks official timer had me at a 1:13.12
Can the lap timer be running while the dashboard is displayed? My work has pics blocked so I can't see them at the moment but is it all there? Is anything else needed to use it?