4-in-1 Diag64cart revision 2 project by Sven Peterson, fully assembled. Requires your C64 already have working PLA, VIC, and MPU chips (so if you have no signal and no test equipment, consider replacing those first, in that order). No case or other items included.
Toggle switches while powered off to load the following ROMS:
Set 1:

• Dead Test 781220 (C64)
  
• Diagnostics 586220 (C64)
  

Set 2:

• Dead Test STID (C64)
• 1541 Diagnostic (World of Jani)
  

GitHub working on genuine Commodore 64, so there's a few scratches on the pins. Ships from USA in pictured anti-ESD bag and a padded envelope. Sold as-is, no returns.