Clusters, Gauges, Speedo & Odo meters

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The gauge calibration could be off also, I had that happen with an oil pressure gauge. It would not move off L until I got it loosened up and adjusted the little tabs inside. It passed the ground test but would not respond to the sender.
 
See info on the early temperature sender starting at post 698 (pg 35) of this thread. When you said the resistance fluctuates rapidly, it got me thinking. This is not a simple resistance element, it has a regulator in it similar to the oil pressure sender and early fuel level sender.
 
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@Engineer8000 perfect! Lol it was in this very same thread that I’d read the info you pointed out above that I couldn’t remember where I’d read it 😂. Sheez, too much “congestion” in the brain these days. Thanks for pointing to the great info @45inCO provided. @GregoryB there’s some of your answers.
 
GregoryB said:
I have a 71 FJ40 with a 2nd generation cluster and a F1.5 engine from a 73 that I've been rebuilding. It has an early style Temp Sending Unit that should match my cluster. When off, the needle sits past H as it should. When on and the engine warmed it, it doesn't move to an appropriate spot on the gauge. If I ground the wire from the gauge straight to the battery, the needle goes straight to C, take it off and goes back past H. Is there a way I can test an early Temp Sending Unit? I read through this and found OHM reading for the later units, but didn't see any numbers for the earlier sensors. I've gone through enough money on this project and the early sensors are over $40, more than I'd like to spend just guessing. With engine warm and running the resistance fluctuates rapidly but stays between 45 - 60 between the top of the sensor and the block. I also measured between the top of the sensor and the side of the sensor, similar resistance.
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what about the TALL sensor union and the engine block itself ?


vintageteqparts.com

Genuine YAZAKI Japan NOS OEM TOYOTA Water Coolant Temperature Gauge Sending Unit Sensor Sender Stamped TEq Fits : SIAMESE F & F1.5 1958-12/74 FJ25 FJ40 Fj55 FJ45 FJ45LV FJ25 - VintageTEqParts.com

Genuine YAZAKI JAPAN NOS OEM TOYOTA Water Coolant Temperature Gauge Sending Unit Sensor Sender - 1958-12/74 SIAMESE F & ...
vintageteqparts.com


vintageteqparts.com

SOLID BRASS Cylinder Head Coolant Temperature Sensor Sending Unit UNION Fitting 90404-16127 , Fits 1956-12/74 SIAMESE F & F1.5 Engines FJ40 , FJ55 , FJ45 FJ45LV - VintageTEqParts.com

SOLID Brass Nickle Alloy - Engine Cylinder Head Coolant Temperature Sender Sensor UNION Fitting - 90404-16127 - SIAMESE F &...
vintageteqparts.com



1651339428254.webp


1651339397243.webp


1651339370197.webp
 
bj40green said:
I don't know why you made that jumper.
The track from the top stud FUEL gauge to the right stud from the TEMP gauge looks good to me.
Did or didn't you get that same voltage on the right stud from the TEMP gauge?
The picture in my previous posting (#610) represents the circuit and how it works and is connected.
Update: I connected the gauge to power as noted above and my temp gauged pinned itself to H. Is this an indicator of a bad temp sensor?
What exactly did you do? There is no need to make jumpers or bring voltage to a point for testing.
If your gauge is too long pegged in the corner, you run the risk of burning it up.
Those gauges are NLA !!!
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Rudi are you still sucking air up there? Coen Wubbels of LandCruising adventure is in Khazakstan and trying to contact you, asked me to help. Hope all is well with you, all is good in Cuenca.
 
Dear All,
i want to know, is there any one who repair the gauges, my FJ40LX 1983 non of gauge working (temp, fuel, Amp).
Please advice
 
@BOBC25060 I can repair it if you dont want to mess with. I have been fixing these for a while here on mud. Shoot me a pm if you want to go this route.


If you want to troubleshoot, You could have a few things wrong and a picture of the back would probably narrow down what is wrong.
 
bj40green said:
Nice job. If you want the voltage a bit lower, you can put a diode in series. A diode drops the voltage by 0.6V so you'll get 7.2 Volt.

Rudi
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Hi Rudy, I might have to rethink this solid state voltage regulator ida, we have the temperature transmitters fail repeatedly. Might be too much constant current destroying the sender, I might try a solid state flasher set at 50% duty cycle.
 
@Redrose

I have been refurbishing/restoring clusters for a while. Here is more or less what you would get. The price has gone up a bit and international shipping will be more but pm me if you are interested

Jack


forum.ih8mud.com

SOLD - GA FJ40 Cluster Sept 1972 to Sept 1973 part 2

Up for sale is another aptly named 5 bulb cluster. This is a bridge year from the old style cluster where the turn signals were on the dash to the later style cluster with a circuit board. This is a fully functioning cluster with the following. Correct working speedometer and odometer. Correct...
forum.ih8mud.com forum.ih8mud.com
 
bj40green said:
The 2nd generation from March ’69 till Sept. ‘72

The OIL and CHARGE lights are replaced by gauges



[URL="http://i1112.photobucket.com/albums/k490/ruud_coco/Toyota%2040%20series%20clusters%20fronts/1970_2.jpg"][URL="http://i1112.photobucket.com/albums/k490/ruud_coco/Toyota%2040%20series%20clusters%20fronts/1970_2.jpg"][/URL][/URL]

[URL="http://i1112.photobucket.com/albums/k490/ruud_coco/Toyota%2040%20series%20clusters%20fronts/1971feb.jpg"][URL="http://i1112.photobucket.com/albums/k490/ruud_coco/Toyota%2040%20series%20clusters%20fronts/1971feb.jpg"][/URL][/URL]

[URL="http://i1112.photobucket.com/albums/k490/ruud_coco/Toyota%2040%20series%20clusters%20fronts/1972june.jpg"][URL="http://i1112.photobucket.com/albums/k490/ruud_coco/Toyota%2040%20series%20clusters%20fronts/1972june.jpg"][/URL][/URL]


Rudi
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Absolute marvel piece this thread is! i have been trying to restore my old 1970 fj45 cluster back to working order after the previous owner put aftermarket ones in. Does anyone have photos from the back? my fuel gauge has three bolts but the top on looks like he has drilled a hole for it in the rear of the cluster so i can't work out if it is the original gauge to match with the sender unit?
 
iananderson said:
Absolute marvel piece this thread is! i have been trying to restore my old 1970 fj45 cluster back to working order after the previous owner put aftermarket ones in. Does anyone have photos from the back? my fuel gauge has three bolts but the top on looks like he has drilled a hole for it in the rear of the cluster so i can't work out if it is the original gauge to match with the sender unit?
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@ToyotaMatt
 
iananderson said:
Absolute marvel piece this thread is! i have been trying to restore my old 1970 fj45 cluster back to working order after the previous owner put aftermarket ones in. Does anyone have photos from the back? my fuel gauge has three bolts but the top on looks like he has drilled a hole for it in the rear of the cluster so i can't work out if it is the original gauge to match with the sender unit?
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Here is the back of a 70 cluster. My guess is someone put a later model fuel gauge into the cluster. The later model fuel gauges had 3 posts. Let me know if you need the correct gauge for your cluster. I am sure I have a few in my stash.

IMG_20220212_191242.jpg
 
JVZii said:
Here is the back of a 70 cluster. My guess is someone put a later model fuel gauge into the cluster. The later model fuel gauges had 3 posts. Let me know if you need the correct gauge for your cluster. I am sure I have a few in my stash.

View attachment 3217889
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Yeah thats the exact photo i have been looking for! I was pretty sure mine was tampered with! I have 2 gauges now for mid 70's which are wrong for mine so if your willing to sell one i'd be grateful as i can't find any for a 70 anywhere
 
iananderson said:
Yeah thats the exact photo i have been looking for! I was pretty sure mine was tampered with! I have 2 gauges now for mid 70's which are wrong for mine so if your willing to sell one i'd be grateful as i can't find any for a 70 anywhere
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I will check my stash and pm you
 
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