speedo correction

[ski]

Howdy I have a 1991 ,cruiser 1hz running 35 inch silver stones and my speedo is 20km out,truck is coming up for cert on suspension work and I was thinking about speedo what do you guys do to correct this ? running lockers so don,t want to change diff ratios etc ,any ideas???. Cheers.

[Mattman]

If its a cable driven speedo you can often change the gearing to correct it. If its electronic jaycar do a correction unit.

[derk]

easiest way if you've got a bit of spare time in front of the computer is to make up a new label for the speedo on paint and print it out on some adhesive paper

[ski]

Jesus I have enough trouble working out how to use my sky/// . Cheers.

[imsohi]

Parrot and sons in Chch do a conversion unit if it is cable, i would ring them as they could prob sort out a elec one aswel. all we had to do was send them the difference in speeds ie GPS--->Atcual 20=25 50=58 70=83 100=116

They made up a unit and we installed was around the $300 mark

[ski]

Thanks man ,I presume its cable being such and old truck. Cheers.

[skid]

Use a gps

Have heard a couple of mechanics say that a gps is a legit speedo.
Not sure if tru, but cheap fix

[Ashohman]

i made ups some dyno labels and stuck them to the speedo just went for a drive with the gps and recorded what speeds were what cert man was happy with this ive got 50 60 70 80 90 100

[churchill]

These guys sell geared units that fit between your speedo cable and gearbox that can either speed up or slow down the cable to get the correct speed.
They reckon they have 50 ratios available(both up and down) and cost between $170-$250 depending on ratio.

http://www.robinsoninstruments.co.nz/ri_services.html

[Mudde1]

Use a gps

Have heard a couple of mechanics say that a gps is a legit speedo.
Not sure if tru, but cheap fix

Not True. GPS is not a legal speedo as it wont work in tunnels, deep cuttings etc.

[mudlva]

Got a reducer here
It was geared to suit 35s from ex31s
Screws onto the trans box outlet and then the speedo cable screws into the adaptor
Pretty easy
It was over a $100 if i remember
$50+courier if you are keen
Got to find it now .....