5" Mac Tools Gatornationals Tach

[buickboy]

Anybody have one of these. I bought one used and want to know who makes it so i can get the hookup right. It has a DIP switch on the back and need to know setting for a 6 cyl. Any help would be appreciated.
Mitch

 

[buickboy]

ttt

 

[buickboy]

Thanks to all for the help!

 

[Scott King]

E-mail me an address and I'll mail you a copy of the instructions.