I am experiencing erratic tachometer on the rpm gauge.
Any idea what caused bouncy tach?
The engine idles fine and accelerate w/o any hesitation.
Tach intermittently swipes to to high rpm then back to the current engine rpm.
Sometime it drops down to 0 rpm while the engine is running at higher rpm for 1-2 seconds and back points at normal rpm
Then no issue for a while.
Then intermittently comes back bouncing around like the above.
Here's a good video I found that is closely resemble my tach issue: