On announcement of the TSO and the patented CiES Fuel Level system on Cirrus Production Aircraft, we were approached by several Vans RV owner/builders.
They asked us if we could build a fuel level sensor for the popular Van's Aircraft Series.
We thought about it & we talked with Van's, Garmin and Dynon. it was easy to do (on initial thought) used the same housing as the Cirrus System, but we didn't get a whole lot of traction with the industry players
At that time we were a new company and this is a new concept - measuring fuel in flight.
Aviation is always skeptical until proven & there were very few systems in the field.