The chrome gauge pod is a factory item and it is plastic, just like the colored ones, all factory pods are plastic. Plastic can be chrome plated as Eric pointed out.
If you have a "satin" finished pod you could polish it to a chrome like finish. I, and a few others here, have taken polishing compound and polished the satin to a chrome finish. It is very similar but not exactly the chrome finish that the OEM pods came in.
If you keep watching here or on EBay you will likely find a chrome pod for sale, they do pop up from time to time if you can wait for it.
Here are is a picture of some work I did awhile ago, polished the factory satin finish steering wheel, pod and shifter to chrome.