Editing RB25 Gearbox - Installation (section)

==Speedo==
An RB20/RB30 speedo sender cannot be used because the RB25 sender is much longer. The gears are also incompatible as the teeth are canted in the wrong direction. You can wire the R33 sender straight to the R31 harness (local only), or you can put a D21 Navara speedo drive in it and screw the R31 speed sender to that. A Navara speedo drive will be perfectly suited if you have 3.7:1 diff gears.

If you use the R33 sender, expect the speedo to be inaccurate as it is suited to 4.11:1 diff gears. You can fit a Pintara gear set, or just use a speedo corrector kit from Jaycar to re-adjust it electronically.

To use the R33 speedo drive on a local R31 just hook the red and black wires from the R31 loom side to the R33 speedo drive. If it does not work, just switch the wires around. Tape off the yellow wire as it is unnecessary.

R31 and R33 speedo drive comparison.

[[File:R33vsR31 Speedo Drive.jpg|640px|center|link=]]

===Part Numbers===
* Navara Speedo Drive: 32702-02G17
* R33 Speedo Sensor: 25010-21U00