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Odd Tacho behavior - Thunder

Craig Tickle

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When the car comes to a halt, the tacho will briefly drop to zero and then return to idle speed, is this expected behavior ?

The engine doesn't miss or stall so I don't see this as a huge problem, I'm more curious if I've set something up incorrectly.

The tacho is a SpeedHut one driven by AUX 17 with an external pull up resistor,

The car has rear wheel speed sensed by DI3 and front wheel speed sensed by DI2, the speedo (also a SpeedHut one) appears to report vehicle speed accurately

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