Wire Harnesses & Cable Assemblies | DSMT Additionally, our harness production department adheres to stringent internal Q.A. Standards and all harnesses are 100% tested to ensure you receive 100% working pieces. You can rest assured that your DSM&T harness or cable assembly will deliver for years to come. These are just a few of the tests our Q.A. Team performs on every single harness: Custom Wire Harnesses - Cypress Industries Cypress Industries builds custom wire harnesses for the most demanding environments and specifications. But our team can also examine the entire production run and the full life cycle of any custom wire harness to utilize materials and production methods that greatly extend the life of your equipment and significantly decrease production costs.