Fuel seems ok for now.....Engine is separate problem, erractic running?

So I did add the Diesel Fuel facility to my Yard, and the instant commands, using them, I think it fills, problem is, there are no indicators to tell me what my Fuel level is, so I'm flying blind, also I think I have an odd engine problem, when I get to some 2% 2.5% grades it fouls out on power, so for the heck of it, I dropped a 8500Hp engine by Properties selection, that didn't work good, then I dropped in a default Diesel Loco Spec engine selection, and it seems to work.
Remember I just changed this in Locomotive Props available, I didn't mess with the Config.txt file at all.....This was done in Surveyor Mode......Then back into Driver or Quick Drive to see the results etc...
Decided I'm going to Email the sRs folks and find out if they have any manuals on this build, I've never had this kind of problem with Loco motives other than not knowing you needed to fuel some of them, this one however I think has 2 different issues......So at the moment it looks like the Fuel is solved....But if no avail, then I'll push the Delete Asset thingy and move on..........
I would install a Fuel controls and gauges, but that is way beyond my simple programming expertise at this time with Asset Fixing. I only know how to do some Color Shading (thanks to Railhead001) and Knuckle, Trucks, and some head lighting issues, beyond that,, I'm uneducated in this part of the arena..........
Thank you to all who helped me with your comments, as you can see, I Naive in this part of Trainz ops..........
