Did you measure resistance from end-to-end of coil trigger wires (blk & grn) and verified wires are continuous with no breaks from ignitor to coil? Just eyeballing wires doesn't confirm it can actually conduct electricity.
You can connect solenoid light to coil wires to see if you're getting triggering signal from ignitor:
https://www.amazon.com/dp/B004FEN84M/
Test on good side 1st as control test. Also works for fuel-injector connectors.
Even easier to use oscilloscope on trigger line at coil terminal to know for sure:
Also do test by disconnecting dash connector. Bad tach may actually short black coil wire and prevent coil from firing.