Do a search for "Radar Scope Tag Data" and you'll get all the info you need.
Not all red Donkey Kongs started life as Radar Scopes. Based on what we've seen so far, the serial number with TKG-2 means it was a radar scope conversion, TKG-3games started life at the factory as red Donkey Kongs. The way to tell for sure is to look at your PCB stack. If there are TKG-2 stickers on the PCB you have a Radar Scope conversion (if you were to take off the sticker you'd see the "TRS" printed on the PCB indicating the PCB was a Radar Scope originally). My bet is that you have TKG-3 on your boardstack (my guess would be TKG3-06)
The best thing you can do is take a lot of pictures of the cab (including the inside) and post them in tag data thread so your data can be added to the database. There was a lot of variation on how they did the early Donkey Kongs.