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84 Toyota pick-up
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7 Posts
Discussion Starter · #1 ·
I just changed out my non SR5 speedo (no tach) to the SR5 tach and speedo in my 84 2WD. (gas/carb.)
The only problem I am having is the water temp gauge doesn't seem to be working right. When I start the truck the gauge starts at the far bottom as expected but after only about 2 - 3 min. the gauge jumps to the half way point and pretty much stays there.
I've been working on this problem for a month or two now without success, but all my wiring is ok as the gages works the same whither installed or if I just use jump wires and test the gauge on the bench.

Any ideas on what I might try next ??
 

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536 Posts
The gauge gets its ground, power and signal through the brass standoff's holding the face plate and servo assembly. Pretty cheesy. If you take the gauge out of the cluster and simply tighten these standoffs just a little bit you will get through the oxidation on the traces that could be causing this issue. I had a fuel gauge that was acting weird after the same swap and that's what solved it.
 

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mr corollla
1989 4DOOR COROLLA
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259 Posts
some body need to write up a helpful complete thread on this and put it at the top of the forum for future use
 

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Soylent Green sales
rock crawler
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12,801 Posts
There's already several if you search.
 

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84 Toyota pick-up
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7 Posts
Discussion Starter · #6 ·
Does anybody have a wiring diagram for the water temp gage for the SR5 Instrument cluster ??

I haven't tried tightening the connections yet, but I will, but in the mean time I was hoping I could see how this new gage is supposed to be wired in.

Thanks

[email protected]
 

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Don't overlook the temp. sender. Just test the ohms throughout it's warming cycle to verify it works within the range its supposed to.
 
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