I installed the 4" and 2 5/8" a year ago.That size fit into the original gauge metal housing with a little modification so they bolt properly into the dash pad.The tach and speedo adjust buttons are easily reached with your finger.The smaller gauges are adjusted with a supplied remote cable and button.My turn signals,hi-beam indicator and fuel gauge are on the speedometer face.I also use their remote shift light on top of the dash.These are a top quality product,the only issues i have is, the tach and speedo placement is dark and hard to see in the daytime.Night is ok.I am sending mine back to change face to a lighter color,hope that helps.Also,in daylight,the gauges all have a reflective glare,maybe their optional domed window would help that.