I just thought of something after reading another post. I guess that 126 and later-design cars have a pump to keep the vacuum up when the engine's not running; however, the 123 and older cars rely on residual engine vacuum. I have a factory car alarm that requires that I unlock the driver's (or front-passenger, but that lock doesn't work well) before I open the trunk. Between this and going out to get stuff, I lose vacuum fairly often simply 'cause of the frequency that I open the doors (AFAIK, the vacuum system works fine).

So, I was thinking...would it be possible or feasible to install a vacuum pump on a 123 (or even an earlier vehicle)? Other than simply maintaining originality, is there a good reason not to?

Just brainstorming...thanks!

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2001 VW Jetta TDI, 5 speed, daily driver
1991 Ford F-350, work in progress
1984 Ford F-250 4x4, 6.9l turbo diesel, 5 speed manual
Previous oilburners: 1980 IH Scout, 1984 E-350, 1985 M-B 300D, 1979 M-B 300SD, 1983 M-B 300D
Spark-free since 1999