Why didn't it have any gauges?
It depends how good you are with splicing and soldering. The easiest would be a OEM replacement for the same model bike. Then it's just plug and play.
If you want something that's universal, you'd have to rig something up to the wire harness
2005 White ZX6R | Yoshimura RS-5 exhaust | Power Commander III | 6k HID Headlights | Vortex Rearsets | Vortex Clip-ons