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Guest Message by DevFuse

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Oil pressure light to meter conversion

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4 replies to this topic

#1 DaveT


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Posted 26 August 2014 - 08:59 PM

I just got a 1993 Loyale.  EA82, 3AT, 4WD.  Unlike all my previous Loyales and GLs the instrument panel does not have  oil pressure or volt meter.  I have a few spare combination meters with oil pressure and voltmeters.   The engine even has the oil pressure sender installed - the wire is connected to the pressure switch. I'm guessing they probably used the same wire in the harness, so plugging in the fancy meter and moving the wire to the sensor should make it work.


I need a look at the schematics for the 1993 to figure out if the wiring is there, or if I have to add wires to get them to work if I swap in the fancier combo meter.


Or has anyone done this? 



#2 BirdMobile


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Posted 26 August 2014 - 09:51 PM

You'll probably need to change the sender unit to a gauge type - the "idiot light" senders are just an on/off switch.

#3 DaveT


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Posted 26 August 2014 - 10:19 PM

It actually has both types of sender already. They screw into different ports on the oil pump.

#4 Mykeys Toy

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Posted 26 August 2014 - 11:59 PM

light sender is sideways  gauge sender is vertical and much bigger around..  BTW never had any luck with aftermarket sender playing nice with factory gauge.



#5 wagonist


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Posted 27 August 2014 - 08:14 PM

The pressure gauge sender & oil pressure light sender are 2 different units.

They screw into the engine in slightly different places, but very nearby to each other.

Look for a blanking bolt angled downwards at 45 degrees near to where you've seen the straight out sender.


Does your car currently have a cluster with a tacho? If not, you're in for a lot of rewiring to change it. The plug are the same, but lamost no wires are in the same position.

If you do have a tacho cluster, then it is very simple to upgrade to the oil/volts cluster. The wires are the same, but you'll be missing the wire for the oil pressure gauge.


Once you have installed the proper sender (just leave the old one in to block it hole blocked up):


  1. unplug the wire for the pressure light sender & plug it into the pressure gauge sender
  2. remove the dashboard cowling & instrument cluster
  3. find the wire that goes to the oil pressure warning light & cut it
  4. find the pin on the back of the oil pressure type instrument cluster where the wire comes in (you'll probably find that position in the plug is empty)
  5. find a piece of wire with the correct pin end to suit the plug (trip to the wrecker?)
  6. join this to the wire you cut for the warning light
  7. reinstall everything

I'm not sure if the cars that had the gauge also have the warning light or not, but note that this method means there is no more warning light, just the gauge.

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