![]() If you don’t have a meter, disconnect the power wire from speedometer or positive wire from the battery to make absolutely sure the power is off. Check the voltage to the speedometer with a meter. If no change is seen after you have made dip switch changes, verify that power was off when the changes were made. Make sure they are all “clicked” in the correct position by toggling every switch once and then setting the default again. Sometimes a dip switch will look like it is pressed in the correct position but it hasn’t “clicked” and is not making contact in the correct direction. Make sure the dip switches on the speedometer are not set backwards. If you have an ECM signal, set the SN74 switches to 1,2 ON with the speedometer dip switches set to 5 6 7 8 OPEN. If you have a VSS signal from a transmission or any 2-wire sender (i.e SN96, SN95), make sure you are using the SN74 with switches 1-4 OFF (2 may be ON if you are experiencing interference) and have the speedometer dip switches set to 5 6 7 8 OPEN. If you are using a SN74 along with the SN16, make sure the dip switches are also set at the default (5 6 7 8 OPEN). If using SN16, make sure you are using the 16000ppm calibration chart and dip switches 5,6,7,8 are OPEN. Are you sure power is off to the speedometer when you make a change to the dip switches?.In what position are the speedometer’s dip switches set?.Where are you getting signal? (SN16, VSS, ECM, MAG Sensor).Speedometer Calibration – 12 Dip Switch Model ![]()
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