Chevy Cobalt Intermittent Issue RESOLVED Instrument Cluster Gauges, Rough Shifting, Power Steering

The linked video contains the comment left by spikedspike that gave me the idea to check this area:    • 2006 Chevy Cobalt with electrical com...  

The affected engine is a 2.2 Liter L61 Ecotech. This engine was also in the Chevy HHR, Malibu, Pontiac Pursuit/G5, and Saturn Ion. As mentioned in the forum posts linked by spikedspike, similar issues appear to affect other engines and car makes/models.

Good video by Cobalt Racing Channel going over how to replace the defective oil pressure switch:    • How to Replace the Oil Pressure Senso...  

Replacement oil pressure switch I used (Part #: D1849A): https://www.oreillyauto.com/detail/c/...

Socket purchased to install part (Part #: 13250): https://www.oreillyauto.com/detail/c/...

Per Carbon's DIY Garage's comments, neither of these repair attempts resolved the issue.
ECM replacement:    • 2010 Chevy Cobalt Instruments going C...  
TCM replacement:    • 2010 Chevy Cobalt Transmission Contro...