Summary

This GPS mount is only for the KTM 990 SM-T and allows to mount the GPS unit (ZUMO 210 in my case) just under the windshield. Requires some work and drilling on the bike, but the result is GPS unit in direct front sight and clearly visible RPM gauge.

Instructions

Print each part from the set and prepare/buy the following stuff:
1x screw M6 x 50 with hexagonal head + 1x M6 Nut.
3x Inbus screw M5 x 50 + 3x M5 Nut + 6x M5 washer.
4x 20 mm rubber (foam) rings with 5 mm holes
3x Inbus screw M5 x 20, 1x Inbus screw M5 x 30 + 4x M5 Nut + 8x M5 washer.

After printing the parts join the L/C/R parts with M5x50 screws. Insert the M6x60 throught the knob and fix the GPS mount part between the left and right arm.
"Undress" the bike :) - unscrew both front side panels and dismount the front cover. Clean the surface and draw axis line, following the front widshield mount (see the picture). Find the right place for the mount and drill 5.5 mm holes (28 mm to the left and right). Note that the whole mount must sit on rubber rings behind the dashboard. Don't overtight screws. The top-left screw on the picture is the longer one (M5 x 30) due to the asymetry of the plastic cover.
That's all, finish the wiring and dress the bike up again .

And my last notice: I took switched 12V from parking light, there are 2 wires behind the light, brown is the ground and the yellow one is 12V.

KTM SM-T GPS top-mount