Are you installing this into an or a different model? Knowing the specific rig can help me give you the exact screw locations for that chassis.
Adding the UI-7 unit is one of the best "quality of life" upgrades for older Icom rigs. It expands your operating capabilities from simple DXing to local ragchewing and emergency FM monitoring. icom ui7 am fm unit install
Once the hardware is in, you need to tell the radio the unit is there. Are you installing this into an or a different model
Switch to FM mode on a quiet frequency. Open the squelch to hear the characteristic FM "rush" or white noise. icom ui7 am fm unit install