I have done several on older and new square body C10s, and later model Silverados, and they are worth every penny-you just need to prep the under surface to keep it solid enough which is not much to do on the C10s-to start clean the surface really good with some brake cleaner, then windex, nothing oily, and cut down any high spots-once done set it in place to see how it fits- the dash cap will come with a tube of silicone and just puts dabs of it as on the instructions to hold it in place when you are all set to install-prep in advance how you will weight down the dash cap since you want it slightly pressed down while the silicone dries-and also on the face of the dash if its on a square body that has the fake wood insert-just make sure to practice ahead of time how you will weight it down not that complicated-and do not over use the silicone or you may have a mess to clean up-