How do you hook a Tach to MSD ignition?

Firing a new engine, my first with MSD. I like to hook my old school mechanics tach up when I do this. Is it still just power leads and negative side of the coil sith an MSD?

MSD box has a Tach output terminal.. The tach won't read the Multi Spark output to the coil

Not if you want to keep that tach. There is a dedicated terminal on the side of the MSD box to drive the tach pulse. The coil pulse on an MSD is about 440volts and will fry a tach. And not all tachs will work with an MSD, especially older ones. There is usually a compatibility sheet in the manual.

Great. Cleverly, I lost the manual. Wish I had some way to watch the RPM at start up.....

you know, you can get a timing light with a built in tach, right? it will count the sparks, and display the number for you......

Msd make an adapter that plugs into the tach port so you can use the older tachs

As previously mentioned, the MSD will have a tach output. I had to add the msd tach adapter for my tach to work.

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Great. Cleverly, I lost the manual. Wish I had some way to watch the RPM at start up.....

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Manuals are all available online on their web site...