Also, even if you remove the computer and battery (which should be done anyway, like before removing the airbag assembly from the old wheel, so remove the driver's seat as well), the SRS light will be lit up.
When I went to a 1984 240GL steering wheel from the airbag wheel in the '92, my steps were:
1) disconnect negative terminal
2) remove driver's seat and set aside (I actually just removed it, then set it on the rear driver's floorboard)
3) disconnect backup battery, then ECU
4) remove center console side panel and pull SRS harness
5) remove column trim pieces
6) remove airbag from wheel
7) remove wheel (clockspring can actually be left in place, I discovered)
8) remove ground wire for horn from column
9) remove stalks
10) remove 1990-93 turn signal bracket/clockspring assembly
11) pull cluster and remove SRS bulb (or clip wire that goes from the SRS harness into the round terminal plug), reinstall cluster
12) install pre-1990 slip ring assembly, connecting both wires removed from clockspring and column
13) reinstall stalks to slip ring assembly
14) mount wheel, or, in your case, the Momo 9010 hub, then the Momo wheel
15) reinstall column trim and console side panel
16) reinstall seat
17) pull all fuses and use a wire brush to clean the contacts, reinstall fuses
18) reconnect battery.
What the '92 looked like after swapping wheels. I also moved the radio down below and added gauges. You can see the airbag wheel in the older 245 in front of the '92.