Table schema:
CREATE TABLE table_name_90 (max_power_at_rpm VARCHAR, displacement VARCHAR, engine_name VARCHAR)

Question: What is the maximum power at rpm for the engine named 2.0 TDI that has a 1968cc displacement?
SQL: SELECT max_power_at_rpm FROM table_name_90 WHERE displacement = "1968cc" AND engine_name = "2.0 tdi"