I install my 98 streering wheel with airbag on my friends 94.Here is what you do.
Here is what you do,open your 93-97 cruise control arm there are resistors on the board,you can either take the valves of the resistor by matching the resistor color bars with a resistor chart (radioshack) or take a multimeter and measure the resistor.Buy the resistor you need and transplant them on the celica's cruise control arm,now you have cruise control.
Get the airbag adaptor from Curt and you have airbag protection.