Speedo

[Calsonic_33]

Just got nismo 2 way( 4.3 ratio) put in my r33. The speedo reads lower then the speed im traveling. This is where the fun starts. My car was a GTS auto. Did conversion to GTSt manual box with 25det but kept the auto diff which had 3.5 ratio(throws up). The speedo was reading lower then when i wacked the nismo item in of course. All i want to know is this just a simple find the right sensor for my gearbox or will i have to find someone to get the right Calibration with the New Diff Ratio

[bubba]

Yours sounds like a bastard similar to mine. Mine worked out quite nicely though.

25 box into 32gtst (was already manual), 3.9:1 diff gears, 280kph Nismo speedo, used the Navara 17T sender with no modifications, speedo now reads ~10kmh high. Not a bad thing so I've left it how it is.

What sender did you use when you put the manual box in? you may have to do some searching and come up with a cog combo that suits your ratios.