Pressing the top button recalls either highest speed or highest tach 
Divides MPH signal by 2, 4, 8, or 16 for cruise computer 
Snap-on cover removable to access four DIP switches 
DIP Switches 3 & 4 — Signal Divider: 
S3 OFF / S4 OFF → Divide by 2 
S3 OFF / S4 ON → Divide by 4 
S3 ON / S4 OFF → Divide by 8 
S3 ON / S4 ON → Divide by 16 
DIP Switches 1 & 2 — Cruise Output Pull-up Options: 
S1 ON / S2 OFF → 3.3K pull-up to 12V 
S1 OFF / S2 ON → 3.3K pull-up to 5V 
S1 OFF / S2 OFF → Open collector (for cruise systems with internal pull-up) 
S1 ON / S2 ON → Not recommended (mixed 5V & 12V pull-ups, ~1.6K to ~8V)