Problems With 911 Tach and MSD

[kdanie]

Many factory tachs don't work with MSD ingnitions. My VDO tach in my BMW won't work off the ignition box but works if I take the pulse off the + terminal on the coil. Try that and see if it works. MSD makes two types of signal adapters to make their tach signal work on factory tachs-they sell for about $30 or so. Call them if you want to use the adapter so you can be sure you get the model that will work with your tach.

ken