How can I know if my factory tach is accurate? How accurate are they usually?
Also, can the electronics be upgraded to work in conjunction with my MSD 6AL ignition? I have been using an Auto meter for the past 10 years, and I want to get back to a stock look, but make sure the factory tach is accurate.


67 Dart GT 340 4 speed
70 AAR Cuda 408 6 barrel
96 Indy Ram original owner
2011 Hemi Durango