4.2L Oil Sending Unit - JeepForum.com
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post #1 of 3 Old 11-03-2013, 07:07 PM Thread Starter
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1990 YJ Wrangler 
Join Date: Jul 2009
Location: NY
Posts: 68
4.2L Oil Sending Unit

Hey does anyone know the OHM range for the oil sending unit? I am going to buy my last few gauges and already have a new OEM sending unit and it would be easiest to just match the new gauge to the OEM sending unit.

If no one knows this information I would settle for the size and thread of the sending unit.

Sorry for this, but I searched and can't find this information anywheres


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post #2 of 3 Old 11-04-2013, 08:23 AM
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1988 YJ Wrangler 
Join Date: Jun 2013
Location: Whittier
Posts: 2,009
You need to download the FSM (factory service manual) PDF. The link is posted here frequently, but I don't have it saved. A search will find it.

For the specific oil pressure sender, the values are:

0 psi = 1 ohm
40 psi = 46 ohm
80 psi = 90 ohm

Make sure you are getting 7.5 volts to the sender. If not, you may have bad wiring or even a bad gauge cluster. Pull the connector from the sender and check the voltage.

Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #3 of 3 Old 11-04-2013, 09:21 AM Thread Starter
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1990 YJ Wrangler 
Join Date: Jul 2009
Location: NY
Posts: 68
I'm rewiring everything new. Thanks for the specifications!
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