If anyone needs new fuel floats, you may have another more accurate option. The CiES website indicates that their floats may now be used on certified aircraft other than Cirrus. They apparently have already got it approved for Cessna 177/177RG. The price for those sensors is $385/sensor and can be used with a JPI930 or Aerospace Logic indicators (which cost about $600).
The first set takes some time as CiES uses an old set of floats, makes measurements, tests, etc. The idea of combining an accurate float with a digital fuel gauge to give accurate fuel level readings is very inviting.
Anybody want to volunteer their aircraft for the first set? Come on... take one for the team.
Design Process:
http://fuellevel.blogspot.jp/search/label/mooney
Prices:
https://www.ciescorp.net/aircraft-kit-pricing.html
Bob