G551 for the Hatchback under the passenger seat grounds fuel gauge sending unit, fuel pump, driver's seat belt switch, passenger's seat belt switch, and OPDS unit. Clean it all you want but unless those are malfunctioning I'd concentrate effort elsewhere.

The CPU is static sensitive whether the dash is digital or not. That said the enclosures are usually made static resistant since static in cars is common.

There is another odd device in this diagram that may help. The dash CPU translates the following exclusively: fuel gauge sending unit, washer fluid level, and oil pressure switch. The dash CPU receives information from some sensors through a Multiplex Control Unit in the under hood fuse/relay center under left side of dash: EPS control unit, VSS, Immobilizer control unit, and parking brake switch + brake fluid level switch. All other sensors come through ECM data lines.