alternative engines

If their SKIM is like the one in my 2002 T&C, it can be a major pain. There is a wireless sensor at your key. When it fails, there is no way to start the engine. People swap in an ECU from a non-SKIM van to get it working.

The "tone ring" rotates with the crankshaft and has teeth or slots for the crank sensor. Sometimes it is cast into the crank and sometimes a separate piece. On Mopar Magnum engines and 3.3/3.8L, it is part of the flex-plate (or fly-wheel).