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How to diagnose speedo not working in HG holden 186/trimatic

Hey, speedo stopped working in my kinga have heard there can be a number of causes. Is there any way to easily diagnose what the issue is before i buy a new speedo cable or open up the gearbox?

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Take the cable off the gearbox and spin the inner cable, if the speedo turns then its in the gearbox, if not likely the inner cable is broken, quite common. You can buy a universal inner, take the end off the speedo and pull the two halves out of the cable, place against new inner and cut to length. You will need to crimp the end piece on. Feed into cable and refit both ends, done.

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easy way is disconnect the cable and turn the back of the speedo with your fingers if the needle moves its most like ok
pull the inner cable out to see if its broken most common place is at the gearbox end
if its neither of these then the drive gear in the bos is the problem the clip that holds its probably broken

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