When mine was stock, I still had gauges. I tracked every Regen to ensure nothing was clogged or close to it. I also like to see the egt. This is useful in a diesel tracking fuel mileage. Egt is a direct correlation to the amount of fuel used. I get much better mileage now watching what gear I'm in. I shift down coming into a hill so it doesn't dump fuel too late. And I run in further hear towing mostly when it's up and down small hills. Fuel mileage isn't as important to me on cost as it is ensuring I make it to the next fuel station. I drive through many places where there's 50 miles between gas stations. One trip I just took, there was a sign saying 96 miles to the next gas station. Andi have the old 26 gallon tank.
