Needle fluttering in tachometer at idle

[jalexquijano]

Last saturday i decided to install a pertronix ignitor 1761 module with 1.5 coil asides from replacing the 4 year old battery with a 12 volt 600 amp brand new battery. Even though i have cleaned and tightened all the female and male connectors at the coil, i am still experiencing some needle fluttering when the car is at idle. Is this normal or could it be fixed? Do i need to widen the gap between the ignitor sensor and the magnet Installed in the distributor?

Edited July 30, 2018 by jalexquijano

[jalexquijano]

The weird thing is that it the tach needle only flutters at idle when the car has been warmed and driven. At initial warm up it remains steady