Getting Temp Gauge to read Correctly

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Rodeo Joe

Well-Known Member
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Got a 2.5 n/a in a series 3......actually got 2 but one the temp gauge reads right the other one doesn't.
I saw a post a while back saying there was a resistor you can get to convert it, I think it might have been by JamesMartin but I can't find it any more. Anybody know about this.....don't know how to do the hashtag thing.
 
@jamesmartin a while ago I saw a post about a resistor to get a temp sensor read correctly on the gauge, can't remember where I saw it but might have been by yourself.....got any more info on it as I could do with it as my 2.5n/a read high on the series 3 gauge its got.
Thanks
RJ
 
It would have to be an adjustable one (potentiometer) or a hand full of varying strengths to try until you found one near enough.
 
Have read loads of stuff about this but I don't see why I have one that works fine and the other heads straight for the red...no its not overheating before you ask got an infrared jobbie to check that.
 
Bobsticle said:
It would have to be an adjustable one (potentiometer) or a hand full of varying strengths to try until you found one near enough.
Click to expand...
So basically if I get the volume switch from an old radio and shove it between the sensor and the gauge I can tone it down to get it within the gauge parameters?
 
Rodeo Joe said:
@jamesmartin a while ago I saw a post about a resistor to get a temp sensor read correctly on the gauge, can't remember where I saw it but might have been by yourself.....got any more info on it as I could do with it as my 2.5n/a read high on the series 3 gauge its got.
Thanks
RJ
Click to expand...
cant remember the exact ones but they were cheap little adjustable resistors
 
Rodeo Joe said:
Good enough for me do you buy it by the yard?
Click to expand...
You have to have one within the range you are adjusting. If your sender unit sends 4 to 20 killa bananas it’s no good fitting one that has a range of 0 to ten thousand killa bananas. You won’t get a fine enough adjustment. Same the opposite way about.
I have no idea how many bananas, killa or otherwise s Land Rover temp sender has under its duvet so you’ll have to have a look.
 
I’m sure someone with a certificate will be along soon and start talking ohms and watts and stuff but don’t listen to them.
They don’t understand them either.
 
Oh and on some fuel gauges you need two pots. One to adjust the full and one to adjust the empty otherwise neither is accurate.
 
Try swapping your senders from one vehicle to the other, The gauge has adjustment on the rear but difficult to get spot on.
After market senders vary quite a lot.
Are the vehicles series 2A /3 if so do both fuel gauges read accurately? Share the same regulated 10V supply as temp gauge!
Is the gauge casing earthed as old style voltage regualtor needs th casing earthed.
 
Blackburn said:
Try swapping your senders from one vehicle to the other, The gauge has adjustment on the rear but difficult to get spot on.
After market senders vary quite a lot.
Are the vehicles series 2A /3 if so do both fuel gauges read accurately? Share the same regulated 10V supply as temp gauge!
Is the gauge casing earthed as old style voltage regualtor needs th casing earthed.
Click to expand...

Yes all the wiring is good, just rewired the whole thing fuel gauges are ok and read as they should.
What adjustment is there on the gauge? I haven't seen anything.
I did notice when I put the new sender in that the gauge doesn't sit at the bottom any more and rests in the first white section. Its a new sender as the old one didn't work and I can only see one listed.
 
Rear of gauge has two small slotted holes one moves the start point the other the upper position.
Hole maybe blocked by a bit cork.
Mark there position before you move any.
Small screwdriver pressed against the open end of slot or make a tool like attached.
 

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Blackburn said:
Rear of gauge has two small slotted holes one moves the start point the other the upper position.
Hole maybe blocked by a bit cork.
Mark there position before you move any.
Small screwdriver pressed against the open end of slot or make a tool like attached.
Click to expand...
That's great, I don't need to alter the high point do I so is it possible just to wind the start point back so when its running it will sit half way?
Oh and the other thing is can I break it? Have been known to be a bit heavy handed:oops:.
 
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