Tommy,
You might check to make sure that the resistance range for oil pressure
for the pressure sender and VDO gauge are a perfect match.
I did encounter a slight difference with a fuel pressure application
(in a 914) using a JPI Gauge and a VDO sender. Adding a 5 to
10 ohm resister in series from either the sender to the ground wire or
the sender to the Gauge would slightly boost pressure readings. In the end, I
elected to leave out the resisters and just go with a slightly lower reading.
Additionally, it may be possible that some of your difference in high/low oil pressure
readings may be due to a slightly lower system voltage at or after startup
in comparison with higher RPM's and more output from the
altenator. Perhaps someone could comment on that possibility.
.... Marv Hamm
=========
Tommy Walker wrote:
> Regarding my oil pressure issue. I'm in the middle of the first annual here's
what I've done to date:
>
> With the Rotax Pressure Sender and a VDO gauge,
> Oil Pressure at start up was 55 PSI
> Cruise pressure was 30-35 PSI
>
> > [b]
>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 0981#200981
