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Message: <blockquote data-quote="mcglsr2" data-source="post: 1212016" data-attributes="member: 15705">When I bought my car, the oil pressure gauge had been replaced with an aftermarket one.  After poking around, I determined it was because the wire that attached to the stock sender has broken/frayed.  I run aftermarket gauges now so it's a moot point to me.  But that may be your issue.As far as pressure, it depends on how hot it is, but I usually idle around 20 to 25, and at around 3000 RPM I'm a little over 40 psi.  I hover around 60psi when cold.  This is on a "healthy engine" (my mechanic told me it was healthy when he was working on it a couple weeks ago and had the heads off).Edit: When you say "mileage just shuts off" do you mean the odometer?  If so, then that is a broken gear in the cluster.  Easy to fix, cheap part on LMR.  As for the speedo, what does it do?  Just sit at 0?  Sits at a reading and stays there?  Could be bad gear in trans, or nick in wire from VSS to cluster?  Do the rest of your gauges work (voltmeter, fuel gauge, water temp)?</blockquote>