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oil pressure sending unit

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mstrcrftr View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mstrcrftr Quote  Post ReplyReply Direct Link To This Post Posted: Mar/12/2018 at 10:38am
Originally posted by 6PakBee 6PakBee wrote:

Have you done any more resistance checks?  I'm guessing you should have about 55 ohms at idle (15 psig) and 25 ohms at 2500 rpm (40 psig), or thereabouts.  This is based on what I THINK a Javelin oil pressure gauge is scaled at, 0-80 psig.


i am getting 72 ohms at idle and it goes down to 60 ohms at about 2500 rpm.  this is with the wire disconnected from the sending unit.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: Mar/12/2018 at 7:36pm
Originally posted by mstrcrftr mstrcrftr wrote:

mechanical gauge reads 60 at idle.  not a pressure bleed thing.. its gotta be two bad sending units.  everything else works..


Hmm.  Two thoughts.  You have 60 psig at idle?  Are you sure the mechanical gauge is accurate?  Secondly, I would order a Mopar sender for a '70 Charger and try it.  The gauge range is the same and the instrument voltage regulator should be the same voltage, so.....
Roger Gazur
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1970 Sonic Silver auto AMX

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Post Options Post Options   Thanks (0) Thanks(0)   Quote mstrcrftr Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 10:19am
Yes the gauge is accurate, it is reading the same as when it was on the dyno and when it was on the dyno we used a different mechanical gauge. once the engine warms up, it goes down a little bit.. do you know if you can still buy a mopar sending unit from chrysler for the 70 charger?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 11:42am
The gauge sending units are readily available from RockAuto.

https://www.rockauto.com/en/moreinfo.php?pk=44334&cc=1496003

The oil pressure still puzzles me.  What you are saying is that it's relatively constant from idle to higher engine speed, both hot and cold?  This flies in the face of everything I've ever seen.
Roger Gazur
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mstrcrftr Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 11:57am
when its cold it will be right at 60 at idle.  when it warms up it comes down to about 30 at idle.  when the engine is revved up, it goes up to about 80 when cold and about 60 when warm.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mstrcrftr Quote  Post ReplyReply Direct Link To This Post Posted: Mar/13/2018 at 12:00pm
Thanks 6PakBee, i ordered that sending unit.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Scene One Quote  Post ReplyReply Direct Link To This Post Posted: Jul/02/2018 at 8:16pm
mstrcrftr, I am having the same problem with oil pressure gauge. I also tee'd and added a mechanical gauge and glad I did but would like to get my other gauge working. What was your resolve?

             Thanks in advance

                         B.P.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mstrcrftr Quote  Post ReplyReply Direct Link To This Post Posted: Jul/02/2018 at 8:28pm
actually it was using the correct ohm sending unit.  i tried all of the ones you can buy in an autoparts store and none worked.   Then Roger helped me out with a part number of a unit that will work correctly.  "A BIG THANKS AGAIN TO ROGER".  Also known on the forum as 6PakBee. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Scene One Quote  Post ReplyReply Direct Link To This Post Posted: Jul/02/2018 at 8:49pm
Thanks I will give it a try and see..
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