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Tach Problem

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glinfante

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I have an electric Westach tachometer on my Skybolt which has an IO-540. Recently I started getting very erratic RPM indications only after the engine gets heated up, 15 minutes after takeoff. All the wires appear secure. Could this be a problem with the sender? Having a hard time finding a replacement sender 303-DGT, anywhere online. Backorder at AircraftSpruce. What would be another electric 2 1/4 " tach that could replace my Westach?
 
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