Sears air compresser 921.166400 where can I get a manual?

You can find the manual for the Sears air compressor model 921.166400 on the official Sears PartsDirect website, where they offer downloadable manuals for various products. Additionally, you might check online platforms like eBay or Amazon, where sellers sometimes list manuals for sale. Alternatively, forums and websites dedicated to vintage Sears products may also have user-uploaded manuals available for download.