Here is a listing from Jays GN, he sales the 7 and 8 position chips for Grand Nationals maybe this will help explain; Pete
http://www.jaysgn.com/
Ultrachip v3.02: The original Thumbwheel chip! This chip allows you to choose from 8 differ rent chip settings on the fly. The selections include anti-theft, stock, valet, and 5 performance settings which increase boost, timing, and fuel delivery. Specify injectors and year. CALL FOR APPLICATION
Ultrachip v3.02.....$165.00
Ultrachip v4.0
Ultrachip v4.0: This is the same as above but custom programmed for heavily modified cars, race cars, etc. Custom Specification form must be completed and sent to us. Chip is then custom programmed and shipped. CALL FOR APPLICATION
Ultrachip v4.0.....$250.00
1984-87 Computer Chips
Most performance chips are programmed by making assumptions about what equipment is installed in your car. For most applications this is good enough, but if you require the ultimate chip setup for your car, for street or strip, we can program your chip based on your car's equipment (turbo, gas your run, exhaust system, head porting and over 15 other parameters). We also carry non-tailored chips that will increase the performance of any Turbo Regal. Both chips have seven different positions (from mild street to full race) to allow you to choose the performance you want. These chips are inexpensive and easy to install. These chips are a must buy for any Turbo Regal owner who wants to increase performance.
1984-87 Custom Computer Chips.....$279.00
1984-87 7 Position Non-Tailored Computer Chip..... $165.00
1984-87 8 Position Ultra Chip for 37 LB Injectors.....$165.00