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2004 FXT 5MT
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Discussion Starter #1
Hi everyone,
I snapped one of the blue adjustment screws off the back of my Lamco oil temp gauge by accident.
I can't seem to find the part number listed on the blue screw head anywhere online.
Anyone know where I could source replacement parts?
Anyone got a spare oil temp gauge (with or without sender) they want to sell?
Looks like the PCB is EN4021-6F and the blue adjustment screw is C "0" (?) 202d where the "0" has a lightening bolt in it?
 

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2007 Forester Sports XT 4EAT
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@cre8value as I see it...
  1. Your easier & least expensive option would be to reattach... glue that potentiometer cover back on VERY carefully
  2. If you look for a replacement, start by measuring the resistance of the potentiometer to get the resistance value you need. To get an accurate ohm reading, you may need to remove the potentiometer from the circuit board.
I'd start with #1. If that repair fails, proceed to #2.

Bobby...

['07 FSXT Member Journal] ['03 X Member Journal]
 
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2004 FXT 5MT
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Discussion Starter #3
Thanks Bobby. Any idea what the 2nd adjustment screw is for, by chance? It was covered with a small sticker on the outer casing of the gauge.
 

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2007 Forester Sports XT 4EAT
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@cre8value no first hand experience, but if it was covered, my guess, factory calibration?

Also, you might contact the manufacturer of that gauge to see if they offer a repair service. You could also do an internet search for companies that repair gauges. Either of these options could be expensive!

Bobby...

['07 FSXT Member Journal] ['03 X Member Journal]
 

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2004 FXT 5MT
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Discussion Starter #5
Follow up Q, Bobby @2.5x_sleeper:

Does this faded and hard to see diagram look accurate to your understanding of the Lamco wiring in our FXTs? Can't seem to find the wiring/pinout/diagram info anywhere, but came across this on Google Images:
 

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2004 FXT 5MT
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Discussion Starter #7
Yes, that habit of obfuscation plus the complete lack of literature online is making the project harder. I have a set of Omori (although looks like Omoni but it's Omori) gauges lying around that I picked up ages ago.

The Omori gauges came with harnesses that actually plug directly into the Lamco harness used for the Lamco oil temp gauge, but the Omori doesn't work. I started splicing with educated guesses and got some progress, but I'm very confused at the same time. The Omori gauge takes a 10-pin connector. Not finding any diagrams so I'm trial-and-error guessing what the 10 pins mean. I've got the gauge illumination working but that's it. If anyone happens to have Omori gauge install guides or wiring diagrams/pinouts laying around, please share.


20200916_133427.jpg
Omori Oil Temp gauge


20200916_133402.jpg
10-pin that goes into the back of the Omori Oil Temp gauge.

20200916_133404.jpg
Other side of the 10-pin that goes into the back of the Omori gauge.


20200916_133355.jpg
4-pin that connects to the sender. Sender only has 2 wires (RTD). Confirmed continuity from sender to the two associated wires on this plug.


20200916_133312.jpg
5-pin Lamco harness. WHT and WHT/BLU are the wires that go to the Lamco sender. I believe RED is +12v, YEL is ILLUM, and BLK is GRND.


20200916_133340.jpg
5-pin Omori harness that plugs into the 5-pin Lamco harness.


Not sure how to proceed. Through trial and error I hooked up the vehicle's illumination wire to the gauge's signal input and was able to actually control the sweep of the needle with my dash dimmer knob. I think this indicates the gauge is functional, at least. Why the gauge needs 10 pins to operate, I also don't understand.

I don't really have an organized question here, or any expectation that anyone knows how to properly hook these up, but figured I'd at least document it if someone were to trip over this mess of a thread in the future.

Even with the Omori Sender > Omori harness > Omori 4-pin plug > Omori harness > Vehicle 5-pin Lamco plug > Omori harness > Omori 10-pin plug > Omori gauge, nothing works at all. No lights, no sweep, no illumination, nothing. Only by splicing one by one was I able to get at least illumination to work on the gauge.
 

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Discussion Starter #8
Update on this project. I sourced a new trimpot of similar specs to the old broken one.




Got it installed by a local small electronics repair shop who had the microscopes and tools to do it. Will be testing soon and will update with results.
 

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Discussion Starter #9
Update - it works.

The trimmer potentiometer used to replace the broken one on the Lamco gauge was was this Bourns 3306F-1-202:

Bourns 3306F-1-202

541658

541659




I've also been troubleshooting the unknown pins on the Lamco and the Omori/Omoni oil temp gauges. The attached images detail what I've discovered so far. Hopefully someone in the future can use this to their benefit.

The only unknown at this point is what the Pin 1 White wire on the Omori gauge is for. It may be for a ground, but not sure (yet).
 

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Discussion Starter #10
Updates...

I was finally able to get everything wired up, tested, and working. I have the Lamcos and the Omoris all hooked up.

Lamco Oil Temp Gauge + Defi Sensor
The OEM Lamco Oil Temperature gauge is now working, hooked up to a Defi PDF00903S oil temp sensor. Is it perfectly accurate? No. I did test it with a heat gun and compared it to the Omori Oil Temp gauge and they are in sync and pretty close, and good enough for me to monitor fluctuations. I did need to adjust the blue trimpot adjustment screw (the one that broke off and I had to fix) to calibrate it with the Defi oil temp sensor.

Omori Oil Temp Gauge + Auber Instruments Sensor
The Omori Oil Temperature gauge is now working, hooked up to an Auber Instruments PT1000 RTD that apparently they've designed specifically for the Omori gauge. The Omoris I have still had the original temp sensor and I bench tested the Omori temp sensor against the Auber Instruments temp sensor and they were almost identical in their resistance curves at varying temperatures. I'm in no way associated with Auber, just passing along the info. Here is the link to the sensor: Pt1000 RTD sensor for JDM Omori Oil Temp Gauge [PT1000JMD] - $32.95 : Auber Instruments, Inc., Temperature control solutions for home and industry

Omori Oil Pressure Gauge + Defi PDF00703S
The Omori Oil Pressure gauge is now working, hooked up to a Defi PDF00703S oil pressure sensor. This one was a complete shot in the dark, there is extremely limited information about the pressure gauge and what sensors work with it. I'm not sure how accurate the readings are, but they seem in line with what oil pressures should be at different temperature and load levels that I've read on here and on NASIOC.

The Wiring...
There is a mistake in my previous post regarding the 10pin Omori plug and what the WHITE pin does. It is not a ground, it is for Illumination. Here is the updated, correct pinout:

542276



Oil Pressure Gauge Pinout
Pretty similar to the Oil Temp, but the sensor wires/pins are different.
542277




Full View Diagram
Here is a (poorly) drawn diagram of how everything is wired up. I am color blind, so please forgive mistakes in my color selection, I did the best I could.

542278



I plan to make a video to better visualize how this was put together. Hopefully this helps the scores of folks looking for a solution for missing/broken sensors/senders for the Lamco and Omori gauges.

Cheers!
 

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Discussion Starter #11
542297


542298


Warming up, idling. Like I said it's not exactly perfect but it's pretty darn close.


542301


Neat to see both boost gauges go at the same time 😂


542300


Also installed this new shift knob + extension which feels great and adds 10hp 👀
 
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