The HKS ALC II has been developed as a plug-in interface with factory A/T Control Unit of the computer controlled automatic transmission on the ‘90-’96 Nissan 300ZX. The ALC II is designed to maintain constant line pressure within the transmission for consistent, crisp high performance shifting. Should the pressure begin to drop within the transmission, the ALC II will signal the factory A/T Control Unit to increase line pressure and maintain it at that level.