Merv,
Installed a "Gas Low" (brand name) propane indicator gauge inline
between the shutoff valve and pressure regulator.
(Check Northern catalog or RV places)
Moved the pressure regulator over a bit to the left.
It's sort of like an inline pressure gauge with a scale.
The reading varies according to air temperature
(you can make your own marks with a marker on the scale,
full to empty, etc.)

Discovered later that one added benefit of the gauge is:
that it tells me at a glance if the gas pipes are leaking and
that the shutoff valve is functioning.
How does it tell me that?
To test for leaks:
If you turn off the main shutoff valve, the gauge should continue
to show pressure for some time after (if the stove valve and
frig valves and any other gas appliances are turned off and not leaking).

To test the operation of the main shutoff valve (on tank):
Turn off shutoff valve, turn on the stove for a few seconds
to release the propane pressure, the gauge should continue
to show no pressure.

Have fun.
Harald
'90 westy

Merv wrote:
> Looking for some feed back from anyone who might have tried any kind of
> propane measuring system.  In line guages to the strips you pour warm
water
> over.  I'm not looking for absolute accuracy.  Just somthing to give me
hint
> of how much may be in there.  I think mainly of my propane heater as I
spend
> a bit of time cold weather camping away from propane facilities.
>             Merv.
>             90 Carat.[with almost awsome propane system]