Classic cars forum & vehicle restoration.

[JC T ONE]

Hi all,

My water temp gauge dont show the correct temp

I have tried several different senders (std Mini items) but the needle only moves a little bit, when it gets hot.

If I unplug the wire on the sender, and stick it direct on to the engine block,
the needle then moves nice and evenly all the way up to 110 degrees,
so I guess I have the wrong sender ?

The gauge is a 2" (52mm) Smiths, half scale & original 1973 model, part no TC4308/00, the scale reads " 30 - 75 - 85 - 110 "
I have been told me there are different senders, for some of the Smiths temp gauges, one guy mentioned 4 different
so who can help ?


Jens Christian
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[michael1703]

you can calibrate certain smiths gauges, on the back are two small sticky circles, take them off and you can insert a small flat bladed screwdriver and tweak them

[JC T ONE]

Hi Michael,

didnt know that thanks for the heads up

Mine is a bit different, and I have found out that its defently a Smiths aftermarket accessorie.

I am sure its not connected to any volt stabilisor, I will try to bypass it, and see what reading I get ?
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[JC T ONE]

I was in the garage tonight, and checked the spare gauge I had (100% identical) .

connected it to 12 volt, and put the sender in the kettle, and it came up to 85/90 degrees.

I then pulled back the dash, to check if my gauge was connected to the stabilisor ?

It wasnt, it had 12volt directly to the gauge, I then tried it with 5 different senders, but it still wouldnt go above 40 degrees.

So my thought are = maybe there are TOO much resistence in the wire, going from the sender to the gauge in the car ?

What I dont understand is that it does go ”full scale” = 110 degrees , if you connect the sender wire direct to the engine block .

will investigate tomorrow, too tired now.
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[Minor1965]