My speedo had been chipped, but still was reading too slow, this was my soloution.
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My speedo was reading 30 -sat nav said about 23, I wondered why there were ques of traffic behind me, at 70 my sat nav said about 64 - so, I took the speedo consul out, removed the perspex cover, and then took off the speedo needle, this I did by using a pair of electical wire strippers, simular to a pair of pliers but with sort of two forks on the end, as you close the strippers togeather they pull on the needle, so that it is lifted off the shaft, be careful that you when you do this you excert upwards pressure on the speedo needle evenly, not prised off one side or the other say with a screwdriver. I refitted the consul minus perspex cover and speedo needle
Then I went for a drive and watched so that the sat nav reading was at a constant 60 mph, this is the tricky bit, I then placed the speedo needle back onto the shaft vey lightly so that it was bang on 60mph, then I compared readings at 70, 50, 40 etc and when satisfied that it was reading exactly the same as the sat nav, I pressed the needle fully home back onto the shaft, I double checked again and then refitted the perspex cover. To this day it matches the sat nav exactly and I have driven through countless speed camers at exactly the stated speed without getting flashed at.
Hope this helps you out...................
Bongo Speedos
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- Bongonaut
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Ours already had MPH on the dial when we got her, The mileage/trip is still in KM's.
I've done the "visual performance" mod aswell. LOVE IT!!
I was going to start the post with " how the heck do you get a bongo into a pair of speedos."
http://upload.wikimedia.org/wikipedia/e ... dologo.gif
Could someone please fetch my coat?
I've done the "visual performance" mod aswell. LOVE IT!!
I was going to start the post with " how the heck do you get a bongo into a pair of speedos."

http://upload.wikimedia.org/wikipedia/e ... dologo.gif

The face on mine had been changed by the supplier - speedo in mph odometer in km. It looks fine to me. When I was looking for a bongo I drove a few which had been chipped and the dial changed and the max speed on the dial was around 180mph. So in normal use only the lowest part of the dial was used.