If the '92 transmission is the same as the '89 (and I think it is), the first thing to check is the engine coolant temperature switch at the front of the thermostat water box. It's a 1-wire switch that makes a ground connection for the OD circuit and closes when the coolant temperature gets to ~176*F. Install a jumper from that connection to ground and see if the OD works. If it does, replace the switch.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum