GEMS www.gems.co.uk +44 1784 470525 Crabtree Road, Egham, Surrey, TW20 8RN, UK GEMS www.gems.co.uk +44 1784 470525 Crabtree Road, Egham, Surrey, TW20 8RN, UK General Engine Management Systems Ltd (GEMS) are a specialist UK electronics engineering company with impeccable credentials and exceptional status in producing high quality electronics systems for the autosport industry spanning over 25 years. Contact Us Contact Us Latest News