I was looking at the Nordskog digital Air/Fuel gauge M7009. This can be hooked up to the stock O2 sensor, right? Also I was looking at a Nordskog digital boost gauge, but it says that a sender is needed which is almost as expensive as the gauge itself. So should I just go with the Autometer boost gauge ATM-2601. Does anyone have any experience with either of these gauges? Are they good or do you recommend something else.