This is a guide to getting a Genius Wizardpen or MousePen tablet set up in Arch Linux. It also work with G-Pen Series.
First, you need to install the X11 drivers. The wizardpen package in aur provides them:
The package will create Template:Filename file which you can access for configuration if required.
Most likely you will also need to disable ABI version checking in Xorg since otherwise wizardpen driver module will not load because of ABI version mismatch. Do it by adding the following to your Template:Filename:
Section "ServerFlags" Option "IgnoreABI" "True" EndSection
After this, reboot or restart your X server.