I'm going to be adding another autometer to my interior. I have a triple a-pillar already, so where can I install one 2 1/16" gauge? 
edit: the gauge has to be easily readable, because it's an important one

edit: the gauge has to be easily readable, because it's an important one

), and then just do another one like an air fule ratio, oil temp, or something that you don't really need but could use. Just my .02