[Healeys] Tach heat sensitive?

[Oudesluys]

I am not so sure that the relative small temperature variations will 
change the resistance of the wire enough to show these variations in 
indicated rpm.
What could change though is the battery voltage. When starting of, the 
battery voltage can be lowish (hence the indicators are not or slow 
flashing) and will gradually rise when driving any distance.
I am not much into electronics but it is just an idea.
Any thoughts???
Kees Oudesluijs
NL

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