Ok so I tried to search for this because I hate asking the same question...so I have an 88 fj62 and the 4x4 dash indicator light stays on. I will press the button nothing.... shift out of 3 hi to neutral and back push the button nothing just stays on...any ideas? Also I just read about the temperature gauge issues everyone seems to have sweet idea for the mechanical tguage radiator cap because my temperature guage fluctuates on the highway only just up and down took a few times of pulling over and checking and I still worry.