The oil pressure sensor, or sender, is the cylinder in the center of this photo. Caterham recommends mouting it remotely so that it is not damaged by the vibration of the engine. The location of the pickup hole on the Zetec engine block is too close to the alternator and oil filter to put it there anyway. There are two alternate pickup holes with silver plugs to the left, but eventually they will be obstructed by the starter.
To mount the sensor remotely requires a flexible braided oil hose. At more than 30 inches, it looks awefully long, but I'm told it works. All of this is very confusing because the parts are actually brake parts, and none of it is explained in the Assembly Guide. Again the folks at www.usa7s.com provided guided me through the mess with photos.
The brass T fitting will be bolted somewhere to the chassis. The top of the T is plugged with a tiny, black threaded plug. The hose attaches to the side of the T, and the sensor to the bottom. A wire from the engine wiring harness attaches to the single electrical contact on the sensor. At the other end of the hose is an adapter to mate the hose with the engine block. It took some finesse to thread the plug and sensor into the T. Turn a few turns, then back off to clean out the threads, and repeat.
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