In my 91, after extensive troubleshooting, I eliminated the ECU from the circuit. It's been good to go ever since. Everything functions as normal to include the thermostat, but I suspect the overheat shutoff function probably would not. I hope I'm smart enough to turn it off myself if I start to overheat.

99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..