Basically, you take a fork (with 4 prongs) and put the 2 middle prongs under the base of the needle and push down on the handle VERY VERY SLOWLY and go step by step, little by little (to make sure it doesn't pop off) and eventually, it shouldn't stick
Also, double-sided take on the back of the gauges themselves will help
question for original poster: How did you attach the gauges? I have seen many methods from the double sided tape (which was my first feeble attempt) to super glue. At the end, I used photo glue...it's stuff that you use with photos when putting into scrap books and when it comes time to trade in or sell your ride, you can take off the guages. works awesome.