I think I gave you the wrong bike originally... best bet is look for 84-85 GPZ900r cluster... that's the one with the bottom mounts, and back cover...
It's been a long time since I looked...
here's a bunch of them....
https://www.ebay.com/b/Motorcycle-Instrument-Clusters-for-Kawasaki-Ninja-900R/178012/bn_21483062keep looking, it's really the best option, as it's "plug-n-play", direct mate up...
the only "mod" you need to do using these is to snip the wire on the Conni harness that runs power to the clock (iirc it's a white wire, but check schematic).. there is no clock on the Ninja, and that wire position in the connector will make the "kickstand down" light on the Ninja cluster glow continously..
Nice feature on the Ninja cluster is the button that when pressed, turns the tach into a Voltmeter while holding the button down...
here's one, so you have the picture... make sure it has the "back" like this one does...
https://www.ebay.com/i/352160131055?chn=pscan't tell if that one has the plugs tho... looks hinky...
I also recall some other Ninja (same era) models had the closed back, and are plug n play...
the other "style" with the open back, you can tell it from the front as those have "mounting holes" at the ends, by the small temp/fuel meters... don't bother with that type...
good luck