Keyless entry...

I have been thinking about how to put a keyless entry system in the car. But first I have questions... Does the driver's side door have a vacuum selenoid? If not, do I just put a keyless entry selenoid on the driver's side door to then activate the existing vacuum system? Or could I just have the keyless system activate the vacuum pump.

Thanks.

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1984 190D 2.2 Auto 220k
2001 Jeep Cherokee Sport 70K
2004 Lexus RX-330 ??K
2005 Chrylser Crossfire LTD 6K

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