OMP steering wheel boss - wiring (horn/turn signal/airbag)
 

I've replaced the stock 380 mm steering wheel with an OMP 330 mm mm steering wheel and boss, as a temporary "quick aid" while saving funds for a quick ratio steering rack.

However, the OMP boss does not facilitate connection of the horn. It has a slipring (?) at the back, but obviously there's no connector in the car. Do OMP supply additional parts? The turn signal self cancellation is also gone, but I can live with that.

To disable the airbag warning light, I can use a 3 ohm resistor? Is a standard 0.5W sufficient?

The resistance had to be precisely 3.0 ohm, so I used a small multiturn potmeter. My "potmeter-airbag" now passes the airbag diagnosis and the warning light switches off as normal :)