Feedback I'm hearing, probably wasn't necessary but after repair I added an inline fuse on one of the wires. If I remember used a 1/2 amp glass fuse and holder, figured the F1 fuse was designed in for a reason, voltage surge, etc.
I'm in the same camp as you, electrical and electronic background. The f1 fuse they use is 250ma. What ever they used is very low resistance. Adding any fuse close to that size bbn always resulted in a reduction in indicated fuel.
You need to also add a smaller resistor in parallel to the first resistor in the loop to get back to the stock resistance.
It's not much of a difference but the gauge does read less.
With the fuse you used your probably not going to have an issue.