Alan,
Temporarily install a simple mechanical oil pressure gauge. It's easiest if you
can have both gauges connected to the engine at the same time, but you can also
test with one and then the other. If you hand prop the engine, it will build
enough oil pressure to indicate on a gauge. Compare the mechanical gauge
reading and your electronic reading.
The VDO pressure senders have a history of failure, especially when operated
attached
to the engine as Rotax does. Vibration is the problem. A better solution
is to remote mount the sender. There are several kits available to do this.
I used one from Leading Edge Airfoils in the US.
Jim Butcher
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