plug

Does anyone have the pinout for the instrument cluster plug and/or circuit board for a 97 tahoe w/vortec 350

Im not talking about the drain or fill plug. I took my 01 tahoe to the dealership to have the transfer case inspected. They told that I have a leak and they "think its coming from the rubber access plug on top of transfer case" I got quoted $600 to repair. I searched the internet for Images, and...