Fuel Gauge System

[britinusa]

My first question (yes, I have spent time reviewing the tech wiki and forum posts  )

The PO replaced the fuel tank level sender unit with a visual indicator. So I have to scrunch into the aft berth and use a flashlight and mirror to view the fuel gauge. The gauge on the engine control panel obviously does not work.

I believe that to test the gauge involves shorting out the Sender connection on the back of the gauge with the -ve (ground) contact which should result in a Full reading.

But I cannot find out what type of sender unit should be in the tank so that I can replace it.

Anyone have info about a replacement fuel level sender unit for the 1987 aluminium fuel tank??

Thanks.
Paul