The simple answer is that if you pull the INST fuse and the lamps stay on, there is a cross in the harness somewhere, OR someone has tried to add something to the ORANGE dash lighting and is backfeeding power into them. Look around your added gauges, tach, etc.
Yep just solved it, not sure what happened but found this in the harness behind the instrument panel, going to see how deep it gets and start repairing it