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tach does not return to zero when motor is turned off

I have a 1972 corvette with an HEI distributor I took out the mechanical tach and sent it to redline in CA to convert to digital tach which they did however when the engine is turned off the tach does not return to zero I was told by the tech's at redline that was normal operation for my tach I dont believe them but Im tired of fooling with it. They charged a lot of money to convert the tach! Is it true that its normal operation for this tach to not return to zero when the motor is turned off??
thanks

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Aug 20, 2012
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by: Paul

My tacho does the same. When you turn the ignition off the tacho stays at the tickover RPM. When you turn the ignition back on it should return to zero. I believe this is normal.

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