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1969 sport satellite dakota digital dash tach not working

M.E.V.

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eastern washington state
Installed a dakota digital dash in my 1969 sport satellite. New m&h harness. The dash functions perfectly in all aspects, however, I cannot get the tach to read.

I have a 4 seconds flat custom distributor with their control box and pertronix coil. I have swapped between it and a factory coil, and to a mopar orange box. I have continuity tested the wire from the negative side of the coil to the dash control box. I have ran a completely separate wire outside of the car to the control box.

I have talked to 4 seconds flat, and dakota digital. 4 seconds said i may need something for rf interference, but could not provide me any values for a coil or choke, or resistor. Dakota is working with me, the first suggestion was to change the cylinder count to "1". The tach wakes and does a guage sweep, during key-on.

I read a previous thread on here which suggested some sort of tach driver is needed.

The original tach functioned fine.
 
Just in case anyone runs into this problem the installation of msd part #8918 generates the correct tach signal to make the dakota digital tach function in their rtx sport gauge cluster.
 
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