The troubles you are having appear to be seperate issues. Check the things I mentioned in my first post on this. Hopefully that will solve the gauge issue. The other things like the cruise control and light troubles may require a wiring diagram to help solve the issues. You will be way ahead if you purchase some factory info on the wiring. Ebay is a good place to go for that or download the info from Subaru for a small fee. You should also have at least a test light probe to check power with.