I'm sitting in a room with about 45 manual gauges, and 30 digital, can't imagine them indexed.
Never heard of this before to be honest, but not dealt with the racing game either. Makes sense for that purpose but doubt my 105 will be racing anywhere.
The one thing that would do my head in when mounting after market gauges is if they were different types, that is different colour, text font, line thickness and so on. I'd want them the same.
How do you like the Auto Gauge brand, any good?