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Unread 03-19-2002, 07:45 PM   #1
CJ8DV8
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Oil pressure switch question

Hey gang! Here's post #1:

Here's something that's been bugging me.
On the passenger side of my motor there's a T in the block with the oil pressure sending unit (for the dash gauge) and what looks like a pressure switch for an idiot light.

Here's the puzzling part: I don't ever recall seeing and oil pressure idiot light on my dash. To top it off, my local Jeep dealer found a need to run a hot lead from the fuse block to one side of this switch (bypassing the factory harness). I checked the cut wire and it had 12vdc. Why it was bypassed is another mystery.

Anyway, what is this switch for? If it is for an idiot light, perhaps it should be pointing to the one behind the steering wheel!

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Unread 03-19-2002, 08:53 PM   #2
OldJeepguy
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1979 CJ7 
 
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Quote:
Originally posted by CJ8DV8:
Hey gang! Here's post #1:

Here's something that's been bugging me.
On the passenger side of my motor there's a T in the block with the oil pressure sending unit (for the dash gauge) and what looks like a pressure switch for an idiot light.

Here's the puzzling part: I don't ever recall seeing and oil pressure idiot light on my dash. To top it off, my local Jeep dealer found a need to run a hot lead from the fuse block to one side of this switch (bypassing the factory harness). I checked the cut wire and it had 12vdc. Why it was bypassed is another mystery.

Anyway, what is this switch for? If it is for an idiot light, perhaps it should be pointing to the one behind the steering wheel!
I never found a use for this extra sending unit on my 79 CJ7 either. I just removed it and all is well.
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Unread 03-19-2002, 10:20 PM   #3
jeepdaddy2000
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Just a thought, I lost an engine about 15 years ago after the line to the mechanical gauge broke(it's hard to see the gauge when you are trying to miss a tree on an ugly hill climb) .Didn't notice it until the lifters started clattering. Ever since then, I run an idiot light as well as the gauge.They are a snap to install and and when they light up you notice them!
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Unread 03-20-2002, 10:20 AM   #4
jeepcherokeev6
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Quote:
Here's the puzzling part: I don't ever recall seeing and oil pressure idiot light on my dash.

cj8dv8, im not sure about your jeep, but on my xj, the idiot lights arent very visible when that arent lit. i mean, you can not tell what they are, until their lit up.

just a thought
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Unread 03-21-2002, 12:59 AM   #5
jeepdaddy2000
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I have an early CJ and the light is in the instrument cluster. It's fairly small but is a lot more noticable then a needle on "0". If you don't like the one you have then you can put your own light(as big as you want)anywhere on the dash that's easy to see.Get an isolated light(one that needs a 2nd wire to be grounded) from your local parts/RV house.run a wire from the switch through the light to the coil side of your ignition switch and it's done!
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Unread 03-22-2002, 04:02 PM   #6
CJ8DV8
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Thanks Guys- I found some gauge troubleshooting instructions on a website that mentioned the mysterious switch... Seems that everyone's right. It said that in some gauge clusters that the switch is for an idiot light and in other applications it tells the computer that the oil pressure has reached 4 psi.

I'll take a closer look at my gauge cluster and if I don't see a light I'll assume it's for the computer.

Anyway, I figure it belongs there one way or the other. Thanks again.
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