Wide band .i have I tachometer in mine it's small but I can see it perfectly where it sits I know most guys like the tach bigger but I just didn't like the big bulky tach cleaner look with the 2 1/16 gauge tach and its in your face so you can see it easy .thanks for asking .
For those of you that purchased the new scanmaster it will fit in the 2 1/16 hole and if you have an alky control it can go on the Flatpods surface or if you have a electronic turbo timer it can go on the Flatpods surface .thanks .