it's a 'black box' that converts the mechanical spin to the electrical signal the speedo needs, not positive for your application, but likely it would install where the speedo cable connects and the spin would generate an electrical signal on a wire to the speedo - might mount under the dash with the speedo cable connected to it, then wires to the speedo - easy to ask Dolphin about your particular setup

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics