It might look radical, but the 2006 Honda Civic Si’s interior layout is extremely functional. Gauges are split between a digital display located at the base of the windshield and a traditional cluster viewed through the steering wheel. In the digital display, which acts much like a heads-up system, vehicle speed, remaining fuel, and engine temperature are shown. A rev-limit indicator located here will flash when revs pass 7,400 rpm on the way to the engine’s 8,000 rpm redline.