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I have 1000 trouble-free hrs on a $15 mechanical
automotive oil pressure gauge. it has a 1/8" plastic line from the
firewall to the gauge. I just put a new panel in and the plastic line
looked as good as new. granted, I have an O-320, but I doubt the gauge can
tell. cheaper. lighter, reliable, fewer parts, no electrical
demands/needs. if there were a leak I would guess it would take quite a
while to pump 6 qts of oil onto the cabin floor. at least you'd know it,
whereas with a sender unit failure in the engine compartment you might not know
until the pressure dropped. after having intermittent problems with
my autopilot (it just let's go sometimes) I realized how difficult debugging
some systems can be and consequentially left all the steam gauges in my
panel.(that eggs in one basket thing) the vibrational environment of an
airplane makes many things fail that won't on the
bench. kevin
----- Original Message -----
Sent: Thursday, November 30, 2006 9:26
PM
Subject: [FlyRotary] Re: gauges
Group,
Fixing to get oil pressure gauge and am concerned about the quality of
the electrical sending units. How likely are they to leak or come apart
and cause complete oil loss?
Using a mechanical gauge eliminates the sender but uses a capillary tube
that can break. What are the pros and cons to electrical gauges?
Wendell
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