Yup,OBD1.
You will need to download TunerPro RT. It's free with a $40 voluntary registration fee.
You will need a prom burner,about $60 on ebay.
You will need an ALDL patch cord,$60
You will need 27SF512 EEPROM's. I recommend at least two. I bought a twofor off Amazon for $20.
Two other goodies that are not necessary but will make tuning much easier and faster is an emulator and a WBO2 sensor and controller. The WBO2 gives you a more accurate readout of air/fuel mixture and the emulator allows you to make changes to your tune on the fly.
The rest is up to you as far as understanding the data and knowing what you can and can't do with it.