I have an XFI 2.0 and eDash, might be picking up a clean mostly stock 87 GN. It has the GNX cluster so has most gauges you'd normally put on the A pillar or console. I don't want to add a bunch of gauges and extra crap, want to keep it simple, but also monitor vitals. I have a fully built on center Stage II and TH400 that will find it's way in there soon, but looking to install the XFI on the stock engine just to get started with it, play with it a little, learn some more before the big engine is in. Looking over the eDash PIDs it can display, knock retard isn't one of them listed. Can I assume a Scanmaster is still needed?