[Vwdiesel] Erratic Tach

[Milt Kaplan]

I checked the nut at the added connection at fuel stop solenoid that R. Browns black box tach signal generator design uses. Its fine. The other gauges work fine at time of the tach odd behavior. Appears not be related to vibration. Also does not appear to be bad ground connection. When engine is started and running while cold everything always works fine. I'm wondering if some electronic component can become erratic after being in use, maybe from heat generated. Resistor/capacitor changing value or some solid state device inside the tach or black box can do this?     
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