Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which supercharger gear ratio has a Octane rating of 68?

### Inputs:
table_name: table, columns: ['Engine', 'Power, continuous', 'Power, takeoff', 'Compression ratio', 'Supercharger gear ratio', 'Octane rating', 'Dry weight']

### Response:
SELECT Supercharger gear ratio FROM table WHERE Octane rating = 68