No one can make a guide because there are far too few individual models, too many different options and builds and far too many individual points of condition that have to be assessed before a value can be determined. Even if you could put all that together at some point in time, the next auction might change everything about your subject.
You can get a general idea by doing a search in MachineryTrader.com for your year, make and model of machine. Look up the auctions first and then the machines being offered for sale. There is a function page in there that will put that info on one page and give you the averages. You can then use your own judgement about where your machine fits within the high, low and average of that marketplace.
Good Luck