Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_19704392_1 (rpm VARCHAR, standard_speed__6th_gear_ VARCHAR)

### Question ###
when standard speed (6th gear) is 88, what is the rpm?

### Accurate SQL ###

SELECT rpm FROM table_19704392_1 WHERE standard_speed__6th_gear_ = "88"