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my `90 f450 was a factory 2wd. it has an aftermarket 4wd system that was added when the truck was new. the 4wd system works great but there are no dash indicators telling you what mode the transfer case is in. i don't know if they ever worked. i don't even know where on the insturment panel these lights would be. the t-case does have a wire harness coming out, going somewhere.
Not sure if this will help but if there are three wires at the transfer case....LB 4x4 indicator, LB/BK Low range indicator and R/Y power you may be able to build your own indicators.....you would have to ground the lights I think.
If your cluster has 3 lights on both lower sides of the steering wheel, try shining a light in the back of the right side ones, 2 closest to the steering wheel.........