After installing my MSD 6AL box, my tach was reading wrong, so I purchased the tach adapter to cure the problem. It didn't work. I got the same reading with and without the adapter. Could it be that my tach is not calibrated correctly or what? What can I do about this?

Did you connect the white wire going to the tach to the tach output (spade terminal) on the MSD-6AL box?


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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

I have tried connecting the white wire directly to the box, and I have connected the white wire to the purple wire on the tach adapter (running a MSD Magnetic Pickup Distributor) I get the same reading with both, except when I run it without the adapter the needle bounces around after 4000rpm.