I have a 2004 Disco. I live in New Orleans. Summertime temps are 85-96F with humidity levels between 70-100%. My temp gauge has always read dead square in the middle. Why is everybody doing this mod? Is this a "leave well enough alone" situation? I have no fancy aftermarket gauges to tell me exactly what temps Im at, so with the factory needle in the middle, about what temp am I running and should I do this mod?