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 Yankee Game Technology, Released in 1989
ROM Version: Grudge Match (Yankee Game Technology)
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Dip Switch:40
12345678FunctionOption
   Off    Adjustments LockoutOff*
   On    On
    Off   Coinage1 Coin/1 Credit*
    On   2 Coins/1 Credit
     Off  Difficulty1*
     On  3
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