Dakota Digital 3 operation manual Spd +, Spd Snd, Spd Out

SPD +

This terminal is used to supply power to Dakota Digital speed sensor SEN-01-5. This supplies 5V DC to the sensor and should not be hooked up to anything else. Connect the red wire from the SEN-01-5 to this terminal.

If you are using a 1-wire VSS output from a computer or a two wire pulse generator this terminal should be left open.

***DO NOT use this terminal to power any other devices it is a low current +5V output.

SPD SND

This is where the vehicle speed sensor (VSS) connects. The signal supplied to this terminal will be used by the control box to calculate the speed reading on the display and also for calculating and saving odometer mileage.

Dakota Digital supplies a 3-wire sensor for most of its kits, SEN-01-5. If you are using this sensor, the white wire is the speed signal; connect to SPD SND. The red and black wires in the cable are power and ground (5V DC) and their connection is discussed in SPD + and SPD -.

For two wire speed sensors such as a cable driven pulse generator, the polarity of the wires does not matter. Connect one wire to the SPD – (Ground) and the other to the SPD SND terminal. The speed sensor ground wire should be brought back to the control box to ensure a proper signal is received. Twisting the ground and signal wires around each other provides an additional level of interference protection. The speed signal wire should not be routed alongside tach, ignition, or other high current or high voltage wires.

For vehicles which have a vehicle speed signal from a transmission sensor or ECM, tap into the VSS wire and connect it to the SPD SND. Consult a vehicle service manual or wiring diagram to determine wire color and location.

This system can accept 4000 ppm – 128,000 ppm speed signals with room for adjustment. The speedometer is fully adjustable and calibration is discussed in a later section.

***Failure to calibrate the speedometer may cause your odometer mileage to increase very rapidly if the speedometer is reading too fast.

***The speed signal wire should NOT be routed alongside ignition or other high current/voltage wires.

SPD –

This terminal is used for speed sensor ground. This insures a proper ground as well as providing proper hook-up for a twisted pair of wires, or a solid state sensor. Only ground the speed sensor here. If you are using a single wire output from a computer for the VSS then this terminal should be left open.

SPD OUT

This terminal can be used to supply a speed signal to auxiliary devices such as a cruise control or radio volume adjustment. The output is scaled to the input speed signal coming into the SPD SND terminal. It can be set to 2000 PPM or 4000 PPM.

***If you are using the bus speed signal option this output will NOT work.

SW 2 (-) or Tach switch

The SW 2 terminal is used for selecting the various rpm, engine, and warning displays and also for entering the demonstration mode. The SW 2 input is activated by a ground connection. The push button switch supplied (or any momentary normally open switch) is wired by connecting one terminal to SW 2 and the other terminal to a ground. When the button is pressed and released, the tach message display will change. When the button is pressed and held for a few seconds, any re-settable information displayed will be zeroed. On systems with two message displays, the one below the tach is dedicated to rpm/warn messages. On

10 MAN 650066:D