My tach stops working when it is too hot and sometimes when it get really cold.
Does any one have or know were I can get wiring diagram? And know if I can wire in an after market?

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If everyone was the same, this would be one boring world.

1937 Chevy pu
1983 300D Turbo (250K) Daily driver
1983 300D Turbo spare motor(250k)
1965 Chevy C-10