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[Doctor Gollum]

And how does the battery voltage gauge look...

[tomuxzz]

And how does the battery voltage gauge look...

On dash it looks like normal voltage.



Or should I test with voltmeter ?

[Doctor Gollum]

And how does the battery voltage gauge look...

On dash it looks like normal voltage.



Or should I test with voltmeter ?

When the rev counter is erratic?

And what's that red light above it?

[tomuxzz]

And how does the battery voltage gauge look...

On dash it looks like normal voltage.



Or should I test with voltmeter ?

When the rev counter is erratic?

And what's that red light above it?

Tomorrow or Wednesday I will do new video with voltage arrow. But I think arrow is stable and always at same position.
That light is seatbelt warning for pasenger.

[Doctor Gollum]

That points towards an issue either with the cluster or the connection from the engine ECU.

The dash is the one major difference between the Catera and Omega, and without seeing behind the cluster there may be additional wiring/plugs for the extra displays/warnings.

I suspect that the alternator only feeds the charge light (and battery voltage gauge), whereas the rpm signal comes from the engine ECU information (crank and/or cam sensor).

If the pedal trick works*, any codes may highlight a discrepancy.

* It should as the car is DBW.

The speedometer issue is almost guaranteed to be unrelated.