I've been retired 10 years, and before that arthritis stopped me building numbers of wheels, but thats crackers.
8/9/10 speed 135mm OLN wheels are about 120kgf driveside, 80 nds.....thats 25 on the gauge for driveside 2mm spokes, and 19 nds with 1.8mm.
fronts want to be 100kgf both sides which is 21 on the gauge for 1.8mm.....bit of a difference for disc of course.
If you bought your gauge from Spa please send it back and get them to check it out.