Martin's switches are upside down! Personal preference I guess as it really doesn't matter which way the switches mount.
Yes, the K75S factory dash pad only has three switch holes.
The square dash pads used on the other K75 models have four switch holes. It can be swapped in on a K75S easy-peasy. They mount to the same holes on the upper triple tree.
There are two models of the square dash pad - one with a power socket and one without. I prefer with socket since I use it to run 12V power to my tank bags for USB charging and other stuff. It also makes battery tender charging easier since I use Powerlet plugs on my battery tenders.
Somebody else's found with a google search:
Since there are limited switch holes one thing I do is use a three position switch to serve two functions. For example, on several of my Ks I have one switch serve as both a hazard switch and an ABS switch. The down position is for the hazard flashers and the up position is ABS.
