I am loving hard on my Orange O-Bass after its upgrade. I did the following:
I replaced the pickups with a DiMarzio DP127 split P.
I replaced the Bridge with the Hip Shot Kick Ass.
I replaced the tuners with the Hip Shot HB-1 tuners.
I replaced the plastic nut with a bone nut.
I replaced the wiring with better quality CTS wiring.
I replaced the stock strings with DR Hi Beams (.045-.105 gauges).
I replaced the pickups with a DiMarzio DP127 split P.
I replaced the Bridge with the Hip Shot Kick Ass.
I replaced the tuners with the Hip Shot HB-1 tuners.
I replaced the plastic nut with a bone nut.
I replaced the wiring with better quality CTS wiring.
I replaced the stock strings with DR Hi Beams (.045-.105 gauges).