Is the limiter located there or is it like my 300 where the limiter is built into the "low fuel warning" relay mounted near the passenger side ashtray?When you take the instrument cluster out of the dash you will see the rectangular shaped voltage limiter on the backside in the printed circuit board and attached with that limiter is the noise suppressor. Just pull the factory limiter with some prongs on it along with the noise suppressor that is combined with the factory nose suppressor and replace them both with a new solid state voltage limiter. I do not have a photo at this time. If you still have some difficulty, when you get the printed circuit board out, take a photo and post it here and I can point them out to you.
The FSM is a bit ambiguous about it, although it does say the Imperial will have that low fuel warning as standard (optional on mine) and the limiter is part of that system.
Looks like this:
Picture stolen from the intrawebs. Yes, that's the same piece used in a C-body.