Thanks for the info! I finally got the display to work, but I didn't have enough time to test targets and overall functionality...hoping to get to that this weekend.
Couple other questions:
Where would I find the 038 notation on the unit? the only thing i see is s sticker on the outside and under "type" its just noted RSB-055.
Are there any other mounting brackets for the display that would work with this unit? The guy that gave me this didn't have one (it had the knobs though) and I've been seeing some on Ebay for the following models 1721, 1731, 1751, 1761 MK2, 1832, 1932, 1942. Thanks again for all the help.