Tach only working for first few minutes

[mattmcss 10+ year member]

My tach doesn't seem to want to work after the car heats up, it works for the first few minutes then it just dies and doesn't seem to respond much. It kind of flickers after that.

I'm going to pull the dash off and see if the needle is loose tomorrow morning, but does anyone else have any other ideas ?

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[Ferendon 10+ year member]

What kind of car? Electrical or mechanical tach? DIS or distributor?