There's a thread discussing the last mechanical-only injection pump for the 300D series...my question is the opposite. What year did injection pump control switch from mechanical to PWM? And will that injection pump work (plumb to the injectors and provide similar fuel delivery rates) in my W123 300D?

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Java Developer/Linux SysAdmin

Current:
*1984 300D ~200K,1989 MR2 250K, 2012 Ford Fusion 4.5K (fiance's car to replace the uber-unsafe cavalier)
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Past: 1998 Chevy Cavalier ,2005 Saab 9-3 2.0T, 1996 Mazda Protege, 1974 Porsche 914 2.0, 1997 Land Rover Discovery 4.0L/5Speed, 1995 Jeep Wrangler