I am going to buy these two gauges today for my blower that I'll hopefully get pretty soon. I was wonder which are the best? Mechanical boost gauge? I know the electronic ones are more accurate, but is it really worth the cost? What kind of fuel pressure gauge? Mechanical as well, or electronic (if they make them). Any sites to buy them at? double gauge pod as well. 2 1/16 good? Thanks. Preferably autometer.