Anyone running an MSD box with a hood tach. My tach worked fine with a stock type HEI hooked to the tach side of the cap. A friend gave me an entire MSD ignition set up he decided not to use. I tried hooking the tach signal to the 6a box direct, then with the msd tach adapter 8920. I called tech support, they said they have issues with the pontiac hood tach with no solution yet? Any ideas?

Thanks