the red warning light has come on for my airbag?

the red warning light has come on for the airbag on my 02 astra coupe, this is due to me having an alarm fitted and the airbag having to come out of the wheel. everything has been put back in correctly but this light is still on my dash. ive been quoted 82.50 for vauxhall to take it off, has anyone got any other solutions please :)