Okay experts ... in reference to the $50 keyless entry kit Texholdem pointed to in post #67 above, the seller emailed me and said that no relays or other extra parts were needed to connect this to my '92 190E.
Could someone look at it this wiring/instructions page for this system ( http://stores.ebay.com/StealMyCar/Manuals.html ) and tell me how to hook it up to my car? Thanks SOOOOOOOOOOOOOO much!!!!!!!!