upon startup few secs odometer working fine as gas pedal is touched it fails?

E30 320i '89.
upon startup few secs odometer working fine as gas pedal is touched it fails, next: odo needle jumps on turn indicator as it flashes or if lights are on it raises a bit still jumping
sounds and goes fine

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[Kerry at Pelican Parts]

Do you mean odometer or tachometer. The odometer will increase the mileage only while the car is moving. The Tach will go up as down as you rev the engine. Sounds to me like you have an electrical problem with the instrument cluster.

- Kerry