I was not happy with the instructions that came with the sending unit ring in that it gave a very small area to seal with, so I did something different:

I cut a slot in the ring so that it could be put through an opening the size of the inner hole of the rubber gasket.

Start one of the short screws to keep from dropping it, then use the long screw to get the float assembly started, then remove your helper screw.

This gives the whole gasket area room to seal, instead of just a tiny lip.

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the sender unit looks like a VDO  do you know the impedance? (Ohms)

I bought the VDO sender units.
The ones I have run from 5 to 80 ohms.

Good job, The addition of locking split washers under the screw heads will retain the screw torque. Why washers aren't called for in the installation is a wonder..  Also a gas sealant on the threaded shank area of each screw.  :) Pat

Did you bend the sender rod a full 125 degrees as in photo guide? When I do, i cant get the 8 to 80 ohm readings.

At about 115 degrees bend I can get 10 ohm to 69 from a point 70mm from front/77mm from tank bottom. I think that will work but its not according to the guide.

John, what gauges are you using? I recommend this one from BeLight:


You can calibrate it to whatever resistance you get.

Make the bend so you get full travel from bottom of tank to top of tank, and don't worry so much about the resistance reading.


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