Miata Mailing List: May 1993, Message #64
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   From: (none)
Subject: Oil Pressure & Pressure Gauge
   Date: (none)


A while ago, one participant in this e-mail group expressed concern
about possible low oil pressure during idle.  I don't recall if that
person was using the stock, dashboard gauge to assess oil pressure.  In
any case, I noticed today that the scale on the stock oil-pressure
gauge is NOT linear.  The scale compresses (gets closer together) at
higher psi levels.  So, if your oil-pressure needle is pointing at the
exact half-way point between 0psi and 30psi, the actual oil pressure
might actually be something like 18psi.  Perhaps the non-linear
scale contributes to low oil-pressure readings?