That is very true. If you dont want to use the stock gauges because they are in the truck, its not expensive to go with electrical sense gauges for this. You can get the part numbers I used here:
http://devestechnet.com/Home/StartKartPlansNice thing about having electric water temp and oil pressure is you can verify your stock gauges are reading about the same. It's a good idea to monitor your oil pressure and water temp for sure.