Instrument cluster
 

I have a 1970 RS with idiot lights . I want to change the lights to gauges. I have been told that chevy always put the same wiring harness in each camaro and that all the contections are there. I also was told I need to buy a newwiring harness. Not sure what is true and before I start to take things apart I want to make sure I have everything I need.
Has any one done this ? If anyone has info to help please share it.

Thanks
Lou C