I have been sent here to help you out.
Firstly, congratulations on your purchase. And I admire your curiosity about your car and how it functions. That characteristic has become sadly rare among new Morgan owners and all others as well.
Yes, I too was curious about that silly looking device you refer to hanging dangerously and unconnected in the front of the engine when I first obtained my first of three Sd1 Morgan Plus 8s decades ago. For the future, you should know that this engine fueling format is called a "Flapper", the most commonly used EFI system in history. Morgan used it on Plus 8s and Plus 4s from 1984 to mid-1990 (but not in the USA aside from a handful). The scores of other marques that used it include Porsche, VandenPlatz, Volkswagen, Audi, BMW, Mercedes-Benz, Rolls-Royce, Bentley, Lotus, Ferrari, Peugeot, Nissan, Renault, Volvo, Saab, TVR, Marcos...
1. Firstly you should know that Morgan does not use all of the parts of the engines and their fuelling systems that they are provided with by Rover, and later Land Rover. This is one example.
2. During my ownership of my Morgans, I have seen knowledge disappear among suppliers, while for a few of is, lore increases. After all your car was made 35 years ago and most of the current Rimmer staff wasn't even born then. In a nutshell, Rimmer misnames this device., and certainly does not know why it is there in doing so. You see it is NOT a diagnostic device. Its proper name is a CRANKSHAFT POSITION SENSOR and was used to badly adjust the ignition timing. Morgan never connected it. Even the 90% of the Rover and Land Rover Factory Manuals of the day do not refer to it. And when you think of it, placing a diagnostic plug underneath the front of a car would be the height of silliness. Why not under the dash as logic dictates and other cars do?
The device and its dangerous pointy bracket should be removed. It merely adds physical insult to pedestrians and pets you sadly hit. They always end up under the car
. The Factory did not remove it as they were paranoid (for other reasons) of the then new EFI and did not want to chance voiding the Rover warranty. They had already done so for some early cars.
On the very good side, Flappers are VERY owner friendly and their EFI systems are, with one or two exceptions, are well supplied with inexpensive components (though prices have spiked in the last decade) until this day, far more than later Plus 8 EFI systems. which can end up on stands for want of parts for long periods. The most elaborate guide to your Plus 8 variant that I know of is on a site called gomog https://www.gomog.com/allmorgan/FlapperPLUS8.htm
There is no longer a diagnostic reader easily available A few were made by Bosch (part#068410002 or ETJ002.02) but they are no longer made or popular as the system is fully diagnosable with a simple 10£ multimeter and this device, if you find one, costs 1000£ with no guarantee it still functions. You will find what you need in section 5 DIAGNOSIS & REPAIR. I usually diagnose at the computer plug as this will include the wiring from and to the components. But if you are leery of that at first, you can diagnose the components directly with the codicil that this will not show a wiring issue.
If you need advice, contact me direct through gomog. I do not regularly browse this forum.
1984 3.5 Morgan Plus 8 Flapper
1990 4.6 Morgan Plus 8 Flapper
2002 4.8 Morgan Plus 8 Flapper (a one off MMC Special)
P.S. Well done Mike! Your sources are less than perfect, but much closer than Rimmer. Yes a crankshaft sensor is a transducer but that is simple a generic term form a device that changes one type of energy to another. Like your Hotwire speedo transducer
, it takes rotation speed and changes it to an electrical signal. A strobe light give you, the owner, the ability to costlessly change the timing, something models after yours do not allow. With a 950 kilo one does not want the timing of a 2900 kilo 4x4.