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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