Is the measuring device, the
mpguino, running at the higher voltage too?
It may read incorrectly at 19v?
In so, tank readings or lower
mpguino voltage would be needed for accuracy?
When I fitted my engine cutout switch on my shifter, I used too small a size cable and had a 1.5 volt drop to my coil, and got bad FE. I upsized the wire in the end.