Item on the photo looks like automotive fuse...
That's because it is.
This is my setup, the fuse has a resistance of about 0.5 milliohm.
I use it as current sense shunt.
That way I don't need extra wiring or separate shunt.
Yes, I had to calibrate it.
I'm planning on upgrading the INA219 to an INA226.
I just have to disconnect the tiny wires, not disturbing anything.
I can even run both the old and the new sensor at the same time to check calibration.