Coyote with Vintage gauges

For connecting the Vintage gauge Tachometer to a Coyote engine the FF Roadster Coyote Engine installation instructions say to splice the purple COIL->TACH wire from the RF harness into the #4 cylinder coil plug wire.

Is there another ways to hook up the Tach other than tapping into the #4 cylinder coil plug wire as instructed?

Also, if tapping into the coil plug wire is necessary what type of connector is best to use to disconnect this wire if the engine needs to be pulled at any time in the future.

Again, thank you for any assistance.
Tim