What size NPT fittings cylnder Head Coolant Temp and Oil Pressure senders

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07-27-2018, 09:38 PM

Jdriscoll

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Year: 1994

Model: Cherokee (XJ)

Engine: 4.l

What size NPT fittings cylnder Head Coolant Temp and Oil Pressure senders

I want to add alternate engine coolant temp and oil pressure gauges. I am looking to pull the cylnder Head temp sender out and install a T-fitting to add the auto meter sender. Same with the oil pressure...pull the factory sender off and install a T-fitting to add another sender for the alternate gauge.

The autometer senders are 1/8NPT I believe. Does anyone know what size the factory sensors are?

im thinking the oil sender may be a 1/8npt?

Asking so that I can have everything on hand before I go to install as these T-fittings I’m not sure I can find locally.

Reason for the supplemental gauges are I have already replaced senders and gauge cluster gauges with mopar parts and temp is still racing 25-30deg high and oil pressure is erratic..possibly a ground somewhere? IDK and I’m tired of searching just want to try some alternate with all new wires and senders and see if I get a good reading.

last question. 1994 Jeep XJ. If I disconnect oil pressure sender and coolant temp sensor and use the autometer senders in lue of the factory ones will it screw with the PCM/Computer? Or will I get any CEL on the dash?

Thanks for the help in advanced

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07-28-2018, 05:05 AM

Ralph77

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Year: 2000

Model: Cherokee (XJ)

I find that sometimes if you look up the parts you are asking about you can find the info you need. I am planning to put a mechanical gauge to my '00 to see what my oil pressure really is. Looking up the sensor they listed the size. So I now know which one of those many fittings in the kit to use. I know that '96 downs are a little different. I use Napa online just cause I am more familiar with how to navigate their website. So I am thinking that this is what you are looking for.
Oil Pressure Switch Thread Size1/8 x 27 in. NPT
Engine Cooling System Temperature Sensor 3/8" x 18 Thread

https://www.napaonline.com/en/p/MPEOP6695SB

https://www.napaonline.com/en/p/MPET...earchIndex=App

Best to double check my findings though.