I had that gauge installed, I love the gauge. Unfortunately, my old eyes had a hard time reading it and I couldn't drive with reading glasses on so I had to go another route. Innovate makes a good product though.

If you change the stock pulley ratio to increase boost you will likely start having belt slip but I have a cure for that. The Stillen belt drive system has a problem in that the belt wrap is very small (amount of the serpentine belt that drives the jackshaft has a very small contact area). If you look at the bracket that the SC mounts to you will see a threaded hole on the front below the jackshaft pulley. I have a additional pulley kit that fixes the belt slip that you will have. Look at the signature build list from most of these guys and you will see Tbatt in their built. That is my kit. If you want more info please PM me. I have the kits in stock. I've sold a bunch of these!

I was meaning to send you a pm thanks for the info.