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We are talking about an overide that lets you lock the converter as required. In Kris's circuit the unlocking is left to the TCU but it wouldn't be difficult to set it up so you have control of the unlocking as well.
The protocol programmed into the TCU allows torque converter to lock only when transmission temperature has reached a certain level, speeds are over about 80km/h on light throttle. Not sure if the Patrol auto allows lock up in third gear (how sad that I have an auto Patrol but don't drive it enough to know that!) but definately in fourth gear. Most lock up converters will automatically unlock on trailng (closed) throttle but automatically relock as soon as light throttle is applied assuming all the other conditions (trans temp warm, 80+ km/h, 4th gear) are still met. The converter should unlock cleanly if the throttle is opened more than about 1/3.
Being turbo charged you are putting a lot more torque through the transmission and converter than they were built for (I know yours has been rebuilt) so the converter lock up clutch may be struggling under the strain. Fitting an unlock switch may be a good idea to ease strain on the converter then only allow it to lock when you are cruising.
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