[FireSale]

Are you running any kind of start retard or "starter saver" box on this car? I had two different MSD retard modules - the cheaper ones - kill the ignition on my series 8 box.

Get a multimeter if you don't have one and trace power back from the contacts on your ignition box.

No rpm displayed on the tac indicates issues with the component that sends that signal. Did you change out your ignition box?

Good luck. I could have written this thread this Spring. Multiple ignition failures after big changes under the hood.