Easy to install.
My car is a Grande and other than if I have my Hoosiers on, it looks 100 percent stock inside and out. The CD Player is hidden, the amps are hidden, the tach is hidden and the guages are hidden.
For my tach, I put it in the ventilation duct on the left hand side. It fits PERFECTLY and no one ever notices it. I only use it when I'm monitoring my RPM or checking something on the highway, so it doesnt need to be in my line of vision. I shift based on ear and feel.
And my gauges are hidden in my glovebox. Mechanical oil pressure, water temp and voltage.