There are 2 knurled nuts holding the clamp on the back of the gauge. That gets the guage out. The capillary tube has to be unbolted from the engine, and then at least 2 clamps holding the tube under the dash have to be removed. Then you have to carefully feed the tube as you pull the gauge. It can be carefully bent as needed, but if crimps it will be ruined.
No, it is definitely not easy!?!
Good luck...
John