Hello.  I've got a '90 Westy Syncro, and did the "water tank float
thing" last summer.

>   - "Fridge pilot on" light also lights whenever the pump
>     is running.

Ours doesn't do this.

>   - I thought the "fridge pilot on" light also used to light
>     when the fridge was running on 12V (with the engine
>     running).

ours doesn't do this either.  The fridge light ONLY comes on when the
fridge is on propane.

>   - My manual says that turning off the panel switch should
>     also disable the pump.

Ours doesn't do this either.

>
> Any thoughts or suggestions?  Anyone know a source for
> a replacement sensor rod or monitor panel?

If you have an accurate digital volt/ohmeter, you can check the
resistance in the float rod.  In fact, if you just slide the float up
and down the rod you can hear it "click" over the two sensor points.
It's a faint "click", but you can hear it.  YOu don't need the panel
lights on, or the float rod even electrically connected to do this.
I posted to the list last year about the resistance values at these
various points.  They are very small.  If you need the values, I can
repost them later.

After verifying with an ohm meter the resistance values at the sensor
points on the float rod, I concluded the float rod was good.  I
traced the problem down to the switch/led panel itself.  I removed
the panel, and touched up all the solder joints on the circuit board.
 Problem fixed.

Hope this helps
Harry.
-----------------------------------------------------
Harry Yates, Langley, British Columbia Canada
'90 Syncro Westfalia   WWW - http://syncro.cr.bcit.bc.ca/hyates
'87 Golf Diesel        email:  hyates@bcit.bc.ca
'91 Miata (Millie)