> The TR3s and early TR4s had Fahrenheit temp gauges with a mid point of
> 185 degrees... which I think is pretty much normal operating temp for
> their engines.
>
> The later TR4s went with a Celsius gauge with a mid-point of 70 degrees C
> which is 158 degrees F. Did they expect that engine to now operate at 158
> degrees?
>
> What has me thinking is that using the 'F to C' conversion formula yields:
> (185-32)(5/9)=85C but if you get the operations out of order it can
> incorrectly yield: 185(5/9)-32=70.8C.
>
> Do you suppose they just goofed on the conversion and ordered gauges with
> 70C as the mid-point? Or was there some other reason for this?
>
> Geo Hahn
Don't know the answer, but my European, late TR3/early TR4 gauge, which I
bought on ebay from Great Britain, has a midpoint of 85C.
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