Click a click detector without looking at it?

The title doesn't make sense, let me elaborate. I would like to know if there is a way for a click detector to be clicked without looking directly at it. You would look away from the part, and a gui would appear on the screen allowing you to still click on the part. It's like Anomaly Breach -actually exactly like Anomaly Breach

I searched the web and found 3 things that seem important to make this work:

mouse.UnitRay.Direction

(point - camera.CFrame.Position).Unit

math.acos(mouseDir:Dot(pointDir))

however, i am an idiot and i have no idea how any of that works, or how to use it. Thus, i have come here