Fully assembled 64 switch tester with a 27" long wiring harness for Williams system 3-7 games, other harness can be made or purchased from pinitech. It has not been used as I have not had the need to this point.

***The following text used with permission from Pinitech.***
Compatibility
The 64 Switch Matrix Tester is compatible with MOST solid state pinball machines that use 64 switches or less and utilize the same type of switch matrix setup (strobes/returns or rows/columns and diodes). Wire harness options are available from Pinitech for as many machines as possible, but there are some manufacturer's machines we do not have wire harnesses for either because they have not been tested or demand would not be there. Also, some newer games (ie. Stern S.A.M. can use more than 64 switches) and the additional rows/cols would need to be handled separately. Gottlieb System 3 for example can use up to 108 switches (12 switch strobes, 8 switch returns). This tester can be utilized with games that use over 64 switches, but you would either need to use 2x testers at the same time (having the additional strobes go to the 2nd tester) or if using a single switch matrix tester the rows/cols could be split into separate connectors so you could swap-in the higher switch numbers.
The 64 Switch Tester has been tested with the following:
•Williams System 3-7
•Williams System 9
•Williams System 11
•Williams WPC
•Data East System 1-3
•Classic Bally/Stern (ie. Bally-17, Bally-35, Stern MPU-100, Stern MPU-200)
•Bally 6803
•Gottlieb System 1 (*see note below)
•Gottlieb System 80, 80A, 80B
•Sega/Stern Whitestar
*Gottlieb System 1 machines use 1N270 germanium type diodes in their switch matrix. An issue of Gottlieb's newsletter "ONTARGET" mentions that using silicon diodes like the 1N4148 will not guarantee valid logic states. Even so, many people have used 1N4148 diodes to replace the under-playfield diodes without issue & in order to be as versatile as possible, the "64 Switch Matrix Tester" uses 1N4148 diodes since most games use silicon diodes in their switch matrix. It should be noted however, that there *could* be switch detection issues on Gottlieb System 1 games since 1N4148 diodes are being used instead of 1N270 germanium diodes. We have not seen this occur yet, but the possibility is there. When replacing the game under-playfield 1N270 diodes it's recommended to replace with germanium diodes, but for a switch tester the 1N4148 diodes should be adequate for testing purposes in most cases.