G,day, wannabe. Have a look at this thread for info about adjusting the speedo :
http://www.nissanpatrol.com.au/forum...=adjust+speedo
And this to check the wiring too the speedo:
http://www.nissanpatrol.com.au/forum...peed-sometimes
There is some simple tests to check the Fuel Sender in the manual.
The sender should range from 4.3 to 5.7 ohms at FULL. 74.3 to 84.8 ohms at EMPTY.
The wiring to the voltmeter is a yellow/red wire (ignition) and it supplies the speedo, fuel gauge via the printed circuit on the back of the cluster. This is a TB42E gauge cluster. The purple arrow, (under the yellow arrow) should be the ignition wire that supplies the voltmeter.
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