I'm going with the Megasquirt unit for 2 main reasons: 1) Cost. It's much less expensive than comparable off-the-shelf solutions and 2) Hack value. Laptop tunability, multiple maps, fine-tuning of fuel/spark, etc.

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1973 280 - Current Project Car
1979 240d - 100% Stock
1982 380sl - 100% Stock
1985 190e 2.3 - Heavily Modified