A sealing gasket for an electrical connector system includes a resilient element configured to seal an interface between a header surface and a connector surface. The sealing gasket further includes thin-film sensing elements in contact with the resilient element that are configured to define a resistance of an electrical network based on a force applied to the sealing gasket. In some configurations, the sensing elements are arranged in a series electrical network and establish a conductive path when the force is greater than a predetermined force at each of the sensing elements. The thin-film sensing elements may be coupled to a controller that is configured to output a diagnostic based on a state of the electrical network.