Re: Tach bounces at startup
Install a spike arresting diode in the tach power supply line.
1N4005, 1N4007 would work.
Install with line side to power source.
If no 1N400X, then get a 1/2 amp 16-18 volt Zener diode.
Install the same direction.
Your problem is a coil is energizing when key turns on.
If you are engaging the starter and the needle action occurs at the same time, then the solenoid coil is sending a spike through the electrical system.
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