The trigger for the 4wd ligh is a green wire with black stripe from the 4wd computer to the cluster at Pin 6 of Plug C29. Plug C29 is a one-row brown plug with 13 pins
Note that the green black wire is a GROUND trigger. You will have to use a relay to power the inclinometer or use the trigger as its ground and power it elsewhere, if its design permits.
You can also get a ground trigger from the PINK wire between the 2-4 select switch and the 4wd ECU. That's at Pin 4 of the F7 plug on the 4wd ECU. F7 is a two row 26-pin white plug.