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Old 09-16-2004, 10:22 AM
crdickey crdickey is offline
TT Enthusiast
Join Date: Aug 2004
Boat: 2003 PS-197 - X7
Location: Lake Elsinore
Posts: 164
Oil pressure gauge problems

My gauge frequently pegs above 80 psi, even at idle.

With a hand held direct mount it reads normal, 40 @ idle and 70 @ running speed.

'03 PS-197
Preditor motor
51 hours

The dealer has replaced;

The sending unit
The MMDC computer
The gauge
Installed a better ground wire

Any ideas?
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Old 08-18-2010, 05:16 PM
morkinbc morkinbc is offline
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Join Date: Mar 2010
Boat: 2002 maristar 230vrs
Location: west
Posts: 6
Thumbs down guages

I am having the same trouble.I have replaced sending unitI also have no amp gauge.My check engine light is on and the engine is in limp mode.I have ordered mmdc box.I hope this cures my problem.
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Old 09-10-2010, 11:31 PM
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BrianB36 BrianB36 is offline
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Join Date: Aug 2010
Boat: mastercraft s&s 1981 302 powerslot
Location: appalachian
Posts: 12
any sending unit I've come across works off of ground as sensor by-metal is heated the ground strengthens an oil descending unit works opposite if oil gauge stays maxed out may have ambient ground trouble meaning any after market eletronics installed they may have taped into the wrong ground
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