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Remove the tachometer from the dash. There are two thumbscrews that secure a bracket onto the back of the tach, which holds it in the dash. Remove these and the bracket and pull the tach out the front of the dash. Connect the tach output from the ignition box to the white/black wire coming out of the plug connector on the back of the tach. Very easy.
MSD sent you a 6425 because they don't make a 6420 anymore. Check their web site. But if you really want a 6420, I have a used one that I'll be glad to sell you.
Good luck!
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