I did the Pingel conversion and I cant see any value in increasing the "reserve". The tank still holds 5.3 gals or so........I used to hit reserve at 125 now I hit at just over 150 if I let it go, but I usually just stop and get gas around 125 like I did before...it seems to be a good range, compatible with the bulk of bikes I ride with
The reason I would do the mod for the increased reserve is that on road trips, the mileage of the Valkyrie when hard running varies wildly. I've gotten as low as 20mpg to as high as 45mpg.
I can't depend on making it to 125 or 150 or any other number. Once ran out at 80! Fuel, windage, heat, and speed all effect the Valk considerably, so unless I just want to guess and stop every 80 miles or so, I need some indicator.
With no gauge, the reserve tells me where I'm at...and gives me a gallon to find some more...and when running in the west, even a gallon reserve is often pushing it.
INHO of course.
-dm