[Matt in Japan]

Recently, I have noticed that my tach likes to jump around a bit. This usually happens during acceleration - while the engine sounds like it's accelerating smoothly, the tach will pause at (for example) 2000 RPM and then jump to about 4000, or whatever speed I'm running. Almost like it's having a delayed reaction.

Does anyone know what causes this and how to cure it?

Thanks...

Matt
1977 Porsche 911S