|
Not my own experience, but;
My friend was having same kind of problem as you, but while doing own speedometer. He fixed the problem by adding around 0-100n capacitor between signal and ground(can't remember, just test different values).
And another had an interference from aftermarket cruise control, whick solved by adding an low-pass-filter on the speed signal, by cutting at around 400Hz.
So, you might want to take a multimeter and measure around..
|