Clusters, Gauges, Speedo & Odo meters (1 Viewer)

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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.
 
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.



what about the TALL sensor union and the engine block itself ?







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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 !!!
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.
 
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
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


 
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?
 
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?
@ToyotaMatt
 
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?
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
 
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.

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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
 
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
I will check my stash and pm you
 

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