Here's a pic of what the dash looked like on our '04 Ninjette:
On the left we had a Garmin GPSMAP60C GPS, using a RAM-mount to keep it on the bars. On the right we put on another one of those moto-fizz clock/thermometers. The angle wasn't quite right so it wasn't as easy to see as it could be.
To power the GPS, I plugged into the accessory power line that Kawasaki was nice enough to put up front near the rest of the wiring harness. They left that feature out of the '08 version, unfortunately, but the Gen 1 ninjettes have two fused accessory lines; one in front and one underneath the right side fairing.