How can you disable omega alarm?

Usuall any alarm system can be disabled by unplugging the box. A local stereo shop can do it or if you can find where the installer put it you could probably do it yourself. Most are located above the brake pedal/steering column area, look for the big ball of wires & follow it to the box. If that won't do it get hold of a shop that sells that specific make or get hold of the manufacturer