Send Subtech and email, they should back up their products with instructions, even if you're not the original buyer. Some of them are downloadable as a pdf from their site, but not the item you have. However I'm sure it will be on file somewhere.
If all else fails, Skip Asay is on the Facebook group, and can probably give you some pointers. Can we see an image of the item? May be able to work it out from that.
