Hi there first time gtr owner after a quick blast in the hills today my 4wd light is coming on and the gauge on the dash is going straight to 50 then the light comes on but it takes a while for the gauge to return to 0 then won't move again till I switch the car off the codes that are getting shown are 1. 8. 9 but the car has no abs anymore and was working fine until today I know the code 1is speed sensor but I am confused with the gauge any help is much appreciated