How to Repair Instrument Cluster "Glass"

My 85-MPH speedo has a cracked face. I can make it functional and waterproof easily, but I'd rather replace the glass. What is the least elaborate and expensive way to accomplish this?

Thanks in advance.

Richard

I replaced my broken glass with scratch resistant Polycarbonate . If you make a pattern , about 1/4 inch undersize , a Glazier might be able to cut one out of glass .

So if I take apart the housing, I can remove the glass from the inside, I assume. It it glued in or clipped in somehow?

It has been many many Years since I did it , If I remember there is a rubber Gasket . If it had been difficult , or problematic , I would have remembered .