That car has the Bosch Djetronic electronic fuel injection system. Commonly called a Djet. It is a simple system and works very well when properly set up. There is a lot of support for the Djets available on-line including original shop manuals. I would avoid the Megasquirt - You tend to be on your own trying to get those systems tuned and working.

Post 1975 Benzes used the Kjet system which is a mechanical fuel injection system but perhaps not as easy to get working well, when things go wrong??

There are several key fuel injection parts:
- The ECU
- MPS (Manifold Pressure Sensor)
- Pulse generator (aka Trigger Points) located below the usual points in the distributor
- Throttle Position switch.
- air and coolant sensors.
- 8 injectors plus a cold start injector
- Djet specific fuel pump
- Fuel pressure regulator
I have a 72 350SL with same engine. At 165k miles runs well and still has all original parts and engine.

Replacement parts are either not available or very expensive. Used parts are not hard to find and existing can be repaired.

Ignition system is straight forward. Points plus transistorized switchgear. Points or points+swichgear are sometimes replaced by a low cost Pertronix Ignitor. No more points to wear or set! Otherwise no issues with ignition.

Compared with modern cars, these V-8s are not fuel efficient! about 14mpg would be good! They do use regular gas.

Much as I love my Djet, I would not recommend one as a daily driver! You might be better to find a good W123 or W116 diesel . The 280SE 4.5 could make a great hobby/collector car.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5