Wow, that's an impressive build
I agree with m37charlie with to the potential to overstress the engine.
I have a Scan Gauge 2 permanently connected to our Sprinter (OM642 V6). It has an engine load field. I was really surprised to see how easily it shoots upto 99% engine load when in 6th on relatively easy climbs.
Dropping down to 5th instantly drops it to 60%ish on the same incline. I know it's obvious but having this info is a great driving/economy aid but could help to drive without stressing the engine. I don't know about yours but ours doesn't have a water temperature gauge, very German. It'll never overheat so you don't need to know, yeah right 
An egt gauge would be great info too.
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