I last fitted one a while back but have never broken or smashed any connectors, that's just cannibalism by people let loose with tools. The boss if I recall came with one resistor and I added another fused 3.9 ohm one from ebay. The only part that sat proud was the pin that the contact spiral has protruding which doesn't quite sit all the way into the hole in the boss, so a minimal couple of mm was trimmed off this, you don't want it compressed when the boss is tightened. Then it is preserved to reinstall the steering wheel later. Be careful removing the airbag connectors, easily broken with ham fisted yanking, I don't think these can be bought. Can't remember what boss kit it was, just something from tweeks going under a Sabelt wheel iirc. I don't remember there being anything technical about the horn wiring either, couple of simple terminals. All OEM plugs can be saved anyway if removing the pins properly, just note the wire sizes for new pins all available from BMW, and if any pins are cut off then just immediately buy the replacements and store with the wheel perhaps, never being caught out etc. As for other more intricate wiring I don't know. Some might elect to code out the airbag, the potential issue there is the risk or temptation to not restore it when later selling the car to someone without their knowledge or understanding which can have some potentially serious implications, I believe why main dealers don't do it when requested.

 

Used an OMP R50/53 hub but had to drill a hole on the hub boss base to take the protruding stub...

This was my route.

OMP Hub/Aftermarket Steering Wheel How-To Needed - motoring|underground

OMP Hub/Aftermarket Steering Wheel How-To Needed Safety & Race Preparation

www.motoringunderground.com

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Excellent! Thank you Sir. The resistor that you bought on ebay, did it come ready to put straight in or just a resistor that you prepared?

 

one of the yellow ones made already, it was a customers car so I'd only use fused

 

Great thank you sir.

 

Thanks mate.

Does anyone know if the Momo boss fits the plug slot and indicator canceller inside it or do most just use OMP?

 

I drilled my OMP boss as above and used the old wiring from the old wheel, I’ve added connectors to the wires so that the old and new wheels are interchangeable.
I also used 2 x 3.9ohm resistors in the 2 plugs.

 

Great thank you sir. As I say, I bought the horn wiring out if a stock wheel for a tenner on ebay. Just means I can keep my wheel in tact.