Speedo with 3.9's

[damankerrison09]

Hey guys, im gonna put 3.9's and a spool in my 5 speed VL... And i was reading on calais turbo that i might be able to get a speedo drive cog from a car with different ratio's and it could fix the problem?

I.E R31 skyline auto cos they hav 3.9's?

Would this work or would it be different cos its from another model car?

Also i have 17's so i know my speedo will already be out a bit but i would rather deal with 1 or 2 k's out then about 17 k at high speed.

Cheers

[IvanTheTerrible]

Another way is to get a inline ratio adaptor. VDO used to sell them. I've used them on engine/gearbox conversions. You can change ratios by fitting different gears to them

[damankerrison09]

Thats handy, but are they for electronic or mechanical speedo's? and WTF is VDO lol

Are they in Adelaide?