The easiet way is to buy a instrument cluster with RPM's on it and have it configured by a Holden dealer using TECH2
Holden VZ Commodore was created in 2004.
How to remove Window Winder Handles from VZ Holden Commodore
www.factoryautomanuals.com
tacho surge
At the rear of the engine, above the bell housing.
one word crowbar
Wire into the brown with red tracer at the ECU
I don't even know. LOL
Next to the base off indicator stalk
i dont know much about the vx commodore, but in my Vz commodore i like to put them in my center console and my coke in the cup holder DANNY!!!!!!!!
http://forums.justcommodores.com.au/holden-commodore-how-s/5541-removing-vt-vx-door-trim.html
where is the bleeder valve for the cooling system for a vz v8 6.0 litre l76 engine just put a new raditor in