Gee....a question that I can actually answer...(sort of )
I will assume that you have RCA jacks in the back of your tape deck.....you need RCA's at one end and a 1/8" STEREO adapter at the other....there are a few different ways to do it but, just tell the dude at Radio Shack or whereever you go that it is RCA's at one end and 1/8" STEREO at the other....They should be able to come up with the right configuration with that info...