Using a 1/8 inch brazing rod and a common copper or brass washer you can make your own. Fill your crankcase with the right amount of oil minus 1 quart, start the engine, stop it after a while and go away for about 30 minutes. Come back and insert the brazing rod in until it bottoms out. Mark the rod at the top of the dipstick tube, remove it and bend a U about 4 inches up from that mark. Slide the washer up to the mark and solder it in place. Now with a hammer and anvil flatten the lower 4 inches of that brazing rod. Insert it until it goes no further and remove it marking the oil level on the flattened part. This is 1 quart low. Now add the extra quart and mark that on the flattened part. You can scratch these marks with a box cutter if you wish. Now using a 1/32" bit drill two holes...one at the full mark and one at the 1 qt low mark. Now remove 1/8" from the lower end of your dipstick (so it won't rub against the pan) and you're done. You can get fancy and scribe horizontal lines if you wish, but I don't think you need to. Your eye will tell you if you're half or one-third low or whatever.
If you have PCV and want to keep this part sealed in order to maintain a slight negative crankcase pressure (which I would suggest doing), find a round piece of copper that fits into the dipstick tube nicely. I used a copper bolt used for electrical work and carefully ground it down. Chuck this into a drill press or drill and using a round edge miniature file, cut two cupped slots around it spaced about 1/4 inch apart. Slide it up to the stop and solder it in place. Get 2 O-rings that match the dipstick tube ID, install them on your dipstick and you're good to go. I did this on mine and it took me about half an hour.
Good luck.
