Quote Originally Posted by thesals
thats one thing i love about the after market restomod gauge cluster i bought for my mustang, it looks like the factory one but they added numbers, a tac, and a vac/boost gauge.... so helpful
the gauge they put on some cars to help you with your gas mileage was a vac. gauge. light throttle good vac. WOT low vac. and if you watched the gauge you wouldn't mash the throttle as hard when taking off.