Is there an extension for this mount? The TPMS display doesn't turn enough from the handlebar to face me. I need one more 'elbow'. What size is the bolt? 1/4"? Thank you.

unfortunately there is no extension for the mount. You might want to look at the flat mount for your unit. the display take a 1/4" screww. It is a widely used size, I am sure you can find many different brands to match, such as RAM mount.