As far as a wideband (A/F) is concerned, I would only buy the Innovate. The best deal currently is the MTX-L. As far as boost gauge, I'd buy something that matches (trim ring) that isn't too cheap. You can always swap the bulb to any color you desire. I wouldn't buy an electrical boost gauge unless you have money to burn or plan to connect it to a datalogger.

http://www.ebay.com/itm/Innovate-MTX...#ht_661wt_1163