notice on the picture above that the ex temp/fuel gauge is one circle. on a dx, the temp is separate from the fuel(temp on a dx is where tach is in the ex and si). when you put in the tach from an ex into a dx, it replaces the fuel, so you have to use the ex temp/fuel gauge as well. I assume you want to keep it stock looking, so get a whole gauge pod from an ex and use the tach and fuel/temp, but keep your dx speedo.