Hey guys, haven't been here for quite a while, just catching up on some reading and see all the old bunch is still here. I happened onto this thread and thought surely this would be here.
http://tinytach.com/diesel.php I have had one of these on my BX2200 for about ten years and it's still working. The Kubota uses the 6mm transducer and the tach has more than just a tach, can do service intervals and job times.
Oh yes, by the way, I finally got my RTV, found one less than two years old with 51 hrs, kept in garage and never wet or muddy. Saved a little over $3K over new. Happy camper here!!!!! I know, you'll have to have pics.