Mercruiser 165, why do i have 2 oil pressure sensors?

KCKracker

Petty Officer 1st Class
Joined
Jul 28, 2008
Messages
291
i have 2 a little one and a large one. i know one goes to the gauge, where does the other ones wire go to? is it an ignition kill? Its not shown on my wiring diagram.
 

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Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
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19,343
the vert one is a oil pressure sender that goes to the gauge and the horiz one is a oil pressure switch connected to the alarm circuit
 

KCKracker

Petty Officer 1st Class
Joined
Jul 28, 2008
Messages
291
i dont have an alarm and there isnt one in the wiring diagram. i know there is a small red light on my cluster, could that be it? also i have an extra wire on my coil + side i cant seem to find where it goes, maybe it grounds it?
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,343
the indicator light usually is for oil pressure and works on a ground . power to the light then to the pressure switch, no pressure grounds the switch and activates the light
 
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