Garmin GLADIATOR TR-1 - Manual (Page 28)

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Tachometry Connections
Honda
+ Gray (positive)
- Black (negative)
On most Hondas the pulses per revolution to 2. For the 6 cyl VTEK it must be set to 1 (Use Setup Code 267)
Mercury (not applicable to Verados)
+ Gray (positive)
- Black (negative)
On Optimax motors: if your reading is incorrect and fluctuates up and down you must change the tach output to analog by taking the
cowling off the motor, finding the 3 gray wires under the alternator (2 will be connected together), unplug those two and moving the
plug from one wire to the open connector on the 3rd wire.
Suzuki Outboards, Except 300HP
+ Yellow (positive)
- Black (negative)
Suzuki Outboards 300HP
Please contact product support
Evinrude E-Tech
+ Gray (positive)
- Black (negative)