how can up my radio?

You need a wiring loom.
As this is an old car, it wil not have the standard ISO connector, so you will need to put a ISO loom in. The loom will need to be spliced into your existing power cable (from ignition) and spliced into your existing speakers.
You can probably get the whole loom from a scrappy for about a tenner.
Cheers.

Tom
January 2007