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To be needlessly pedantic, fuel injection does require a micro. I only say this because I deal with classic Bosch K-Jet systems often.

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Detroit diesel two strokes were entirely mechanical. As were cummins engines like b5.9 with a bosch p-pump. In fact all diesel engines have fuel injection, and they were all mechanical up to the 80s/90s.

I assume you meant to say does not require a microcontroller, given that Bosch K is a mechanical FI system.

There's also analog EFI, which was rare and expensive and otherwise not great: https://en.wikipedia.org/wiki/Bendix_Electrojector

The early electronic components were not reliable in an underhood environment and were not easily modified as engine control requirements advanced. Most of the 35 vehicles originally equipped with Electrojector were retrofitted with 4-barrel carburetors.

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