Did you get the install kit for the 88-98 chev/gmc, . You need a metra 99-3000 kit, do a google and you'll see the nose piece deal. You can also get a pocket kit to go where the control head was. Also you'll save your self some hassle if you get the wiring harness adapter kit. First stereo I installed was an AM/FM indash 8 track player, next vehicle was a 1964 Ford F100, and I had to cut a hole in the metal dash, cause in 1964, trucks didn't have radios as a factory installed option.