I'm looking at putting 3 gauges in my nova, oil pressure, water temperature and air/fuel ratio... I don't like the idea of putting them on the A pillar so am stuck about where to put them. I was thinking of removing the heater controls (as I don't really need them) and putting the gauges in there. Why size gauges would I need to put them into the heater controls? I see most gauges are 52mm. Anyone know the size I need and also any other ideas of where they could go? Thanks