Do you need aftermarket gauges on your diesel?

The very first thing I bought for my truck was the Edge CTS2 Insight. With me having an 2006 F350 with a 6.0, I had to keep an eye on the temps on my oil and water. During last summer and it being really hot in south Texas. My deltas were over 15 degrees. I got the truck bulletproofed in January. Now my temps are back to normal. I had a EGT added to keep check of my exhaust temps. Now I feel confident that my truck can go many miles.