Igniter or coil plug, betcha. LC filter is both of the doojiggees under the coil bracket, and only conditions the signal to the tach - wont affect spark unless the circuit grounds. TPS plug bad will throw a code and run bad, but not just chop off spark.

It's spark related for sure with the tach going dead and not responding and not twitching while cranking.

Best bet is the igniter or plug. If igniter, may be a heat related failure. To test, start a cold engine. After warmed up, use a hair dryer or heat gun to heat up the power transistor/igniter and see if it dies, then will immediately restart after you cool off the PT with a cube of ice in a plastic bag or a/c juice.