[T3] 73 T-3 oil temp?

Jim Adney jadney at vwtype3.org
Wed Sep 8 07:18:48 PDT 2021

On 7 Sep 2021 at 11:39, William Jahn wrote:

>  I read that Gene Berg said most of the VDO and other brands of oil temp
> gauge senders were not accurate in a certain range , and I can't recall off
> hand what the range was. I'm also not sure if he was referring to both the
> gauge and sender combined. 

My recollection is that Berg simply said that all the temp sensors he had 
tested were inaccurate. I'm willing to assume he meant the combination of 
sensor and readout, since nothing else makes sense. I don't recall his 
mentioning any particular range, but the only range you're interested in is 
the one that just happens to be around the boiling point of water.  

Gene said this as an introduction of his Beetle dipstick sensor indicator, 
which is just an on/off switch that you wire in parallel to the oil pressure 
switch, so it also turns the oil pressure light ON at 212 F. This is quite 
reasonable since that's a good checkable point for oil temp.

It was this note from Gene that made me realize that this was a good way for 
anyone to check the accuracy of their gauge. If you happen to live at high 
altitude, where water boils at lower temps, you may want to drive downhill a 
bit to do this test, or find a chart for boiling point of water vs. altitude.

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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