The following are the Dip Switch settings based off of MAME 0.180 source code.
 
Use this information at your own risk!  The information was parsed from the MAME source code and could contain errors as to the state, order or descriptions of what the switches do.  If you find an error, please let me know on the Contact Us form and I will work on correcting the issue. 
 
 
 
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Manufactured by NMK / Tecmo, Released in 1993
ROM Version: GunNail (28th May. 1992)
Print
Dip Switch:SW1
12345678FunctionOption
Off       UnusedOff*
On       On
 Off      Off*
 On      On
  Off     Off*
  On     On
   Off    Off*
   On    On
    OffOn  DifficultyEasy
    OnOff  Hard
    OnOn  Hardest
    OffOff  Normal*
      On LanguageEnglish*
      Off Japanese
       OffFlip ScreenOff*
       OnOn
Dip Switch:SW2
12345678FunctionOption
OffOffOff     Coin A1 Coin/1 Credit*
OnOffOff     1 Coin/2 Credits
OffOnOff     1 Coin/3 Credits
OnOnOff     1 Coin/4 Credits
OffOffOn     2 Coins/1 Credit
OnOffOn     3 Coins/1 Credit
OffOnOn     4 Coins/1 Credit
OnOnOn     Free Play
   OffOffOff  Coin B1 Coin/1 Credit*
   OnOffOff  1 Coin/2 Credits
   OffOnOff  1 Coin/3 Credits
   OnOnOff  1 Coin/4 Credits
   OffOffOn  2 Coins/1 Credit
   OnOffOn  3 Coins/1 Credit
   OffOnOn  4 Coins/1 Credit
   OnOnOn  Free Play
      On Demo SoundsOff
      Off On*
       OffUnusedOff*
       OnOn
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