I added it along with the small fuel gauge. Might as well go big since I was already swapping from idiot lights to gauges.
I did a writeup here.
https://www.gmsquarebody.com/threads/instrument-cluster-swap-from-idiot-lights-to-full-gauges-k5-k10-k20-k30-c10-c20-c30.45632/#post-966363...