Reliable information for an Opel Omega can be found at the official Opel website. They have a comprehensive database regarding all their released models.
It was built by Opel as a version of their Opel Omega, in Rüsselsheim, Germany.
check
Timing marks
You have a problem with the charging system.
The Holden VN Commodore was released on 17 August 1988. This, and subsequent versions based their bodywork on the Opel Senator and Omega. The VN was also similarly based on the Opel Omega.
Opel Slalom was created in 1996.
Opel Eisenach was created in 1990.
Opel GTC was created in 2007.
Opel Agila was created in 2000.
Opel was created on 1862-01-21.
Opel Astra was created in 1991.