The only switch is for the Center Differential Lock to the right of the steering wheel above the AC control unit.
No switch or external control for the mechanical locker.
It is a mechanical locker...not the OE Electronic Locker. The mechanical locker i installed is manufactured by Aussie, i think this is the link where i purchased this device at: Aussie Locker XD-20830 Toyota 8" r.g | Locking Differential | Aussie Locker By Torq Masters
We are selling our 1997 40th Anniversary Edition FZJ80, I have owned this rig for the past 4-5 years. In that time it has been driven occasionally, (mostly in town), for a total of about 15,000 miles. Current mileage on the odometer is just under 174,000. This is the same rig in my profile...