IMO volts are pointless just get a air/fuel ratio gauge and call it a day But like i mentioned earlier something like the MSD dashhawk could easily take place of all your gauges and mount next to your a pillar on the dash and you would have pretty much all engine paramters at a glance. I think gauges are obsolete now compared to multi function displays
A/F is a bit pointless unless he's doing his own tuning or having a in car tune. Plus $100+ yea costly just to have it to fill his pod.
Squirrels are my engine. I need a Ford Regal
04 Comp G.