Tachometer Flickering at Low RPM
You did not list the maker of the tach you own. Is it a cheapy, or $$$$$...?
You are not using an ignition module...? just the signal striaght from the coil?
If so, the duration of the signal at low RPM's maybe smaller then the tach wants to see, so it is doing it's best to count short ignition pulses.
Call the MFG of the tach and see if there are any other reports of this, and if it is normal. It maybe normal for the make of your tach.
[ This Message was edited by: Mikes66 on 6/1/07 12:18am ]