Hello, I'm new here, but figure to introduce myself with a posting on this topic.
The sender acted in a fashion apparently well known to this forum, but not to me, and was certainly anxiety and buyer's remorse inducing. No worry, we really enjoy and like this car, aside from it's various electrical gremlins. First target was the oil pressure sender, which only read 0 or 35 or 70psi or displayed a random needle dance with flashes of the oil pressure warning lights (gauge and center light).
As has been posted the terminals are exposed and the mechanical sender is fragile. It's a German (VDO) item used by Volkswagen, Ferrari, Maserati and probably many others. 0-10Bar range, with a .75Bar switch to ground on the WB terminal (unused in the 4200GT).
Key to removing it without disturbing the manifold, was a removal tool without slop. A standard crow's foot is too large, but milling (or grinding) one from 3/4" up to 24mm gives the right outer dimensions to fit in the minimal space. Next is to remove the slop between the 3/8" wrench extension and the crow's foot with either metal or electrical insulation tape (I used two layers over the extension end) and hammer the extension into the crow's feet. Remove three wire harness bolts, one is the nut on top near the bellhousing to the right of the clutch observation opening, the other two are on the back of the left cylinder bank. One of them blind (I used a mirror).
Loosening those allows enough movement of the wiring harnesses to place the removal tool. Careful not to pinch or crunch the crank sensor wiring, which should not be removed.
A two foot breaker bar using a 3/8" - 1/2" adapter was sufficient to crack it loose. If the slop is not removed, no amount of breaker bars or extension pipes or force will move this item, as noted by previous posters.