Yeah, I think it was ~3am when I was playing and thought to look for such measuring mod, then wrote this one, so didn't really think much about graphics, just slapped 3 green brush strokes in gimp as an overlay on top of vanilla pole.
It's probably best to sidestep the issue entirely and make a different mod called "power measuring combinator", which would, instead of unique pole, add/track special recolored/remodelled constant combinators, grabbing power grid stats from any closest pole-type building to them.
That should work with any poles, including modded ones, and combinator thingies should fit anywhere.
It's an easy change, but should probably be a separate mod, as don't think it'd be a good idea to change whole mod like that, including the name and how it works in any existing games.
Iirc there was a subforum with sprite/graphics requests, guess I'll check if there's anything to pickup there for alternate constant combinator sprites, as simple recolor is kinda lazy, and it'd be more work to make a decent model in blender that'd look sharp on small sprites than everything else about this mod combined :)