Tach Problems - Is distributor/coil wired correctly?

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I've go an MSD 8366 distributor and an MSD 8207 blaster coil. I have the distributor wired as indicated below, but when I turn on the ignition, my Autometer Nexus tach just flashes. I found a thread on a corvette forum that shows the 2-pin connector as + for A and - for B. Does anyone know which way is correct? I've actually tried it both ways, but the tach still flashes.

Do I have the 4-pin connector wired wrong? Can I test the tach by just grounding the tach wire to get 0?

Note that the engine isn't running yet. Want to make sure my wiring is correct before attempting to start it.



Any help would be appreciated!

[esenior]

really? Not one reply?

[esenior]

OK...tach problem solved. Heard back from Autometer today and they say that the tach flashes whenever it doesn't detect a tach signal (see note below). Now I just need someone to confirm the wiring from the coil to the distributor.

The tachometer will flash when it does not see a tach signal. This is normal if you just turn the key to the on position. After you start the vehicle, if it is still flashing, we can look into why there isn’t a signal. Unfortunately there isn’t a way to program the tach to not do this.

Let me know if I can assist you any further.

Kevin
Tech/Service

[esenior]

Just got off the phone with MSD...turns out the 4-pin connector is correct, but the 2-pin connector is backwards. A is Coil + and B is Coil -