ideas for crap speedo?

[jakwoo39]

just got my truck going, and the speedo is working but it is about 25ks out, so when i was following other cars in a 60k zone it was showing about 35ks
i have put in a new cable (old one snapped)
and new drive gear (old one missing teeth)

but when i put the new diff ratio in and the 35's on its miles out

has anybody got any ideas to fix

[Sadam_Husain]

Yep pull the plastic cover off the speedo and black out the numbers and take it for a run with a GPS and relabel the numbers at the right places

[chrome]

navman

[kbushnz]

You want something like this...
http://www.marks4wd.com/products/tyre_m ... ction.html
I am sure there are places in NZ who do them...
Basically is a little gear box which changes the ratio to correct the error.
Use a GPS to see how far you are out...

[WRNGLR]

My Jeep does the same after bigger tires and a mega short Slip yoke eliminator, at the moment I run GPS off my phone, I'm doing 100 km/hr when Jeep speedo says 75km/hr, will be getting a truspeed calibration box from summit racing in the US when all the planets align correctly. (Read $$$$$$ + ok from Wife(bank manager))

http://www.summitracing.com/search/?keyword=truspeed&dds=1

[wjw]

Was $250 for parrotts to make up an adapter box for the prado speedo...

[jakwoo39]

i allready have a nav man nicely built into dash but it takes ages to start up and is this enough to pass a warrant?

the government also wont be too happy with me getting like 30% more out of my diesel kms haha

[pruggerdore]

dont think you will be getting a warrant. especialy as a diesel. im with sadam, kiss, keep it simple stupid. but then again as a diesel maybe not as odometer will still be out. so i think I would be puting a series of dots on. 50, 70, 100 and leave it as is. odo will save you money and wof man have no reason to think its inaccurate or care.

[jakwoo39]

no need to bother any more the speedo passed a wof on monday and flew through cert today with no issues