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Speedo Help Required

As most of you know I am currently converting my Jubilee to full factory V8 specification. Part of the changes are the fitment of original V8 gauges (all of which I have managed to obtain). My problem is that I want to reset my V8 speedo to 00000 and having taken it from its housing it does not look like it is easy to reset without removing a lot of bits and bobs-which I am loathed to do as it is fully working. I have tried an electric drill in the back but even with the speedo doing in excess of 120MPH it takes ages, obvioulsy 2 miles a minute. I have since just turned the milo by thumb and have managed a mile every 5 seconds (720MPH) which means that,as I have just under 20,000miles to go, it will take me about 25 hours to get back to zero.

Any ideas would be most welcomed as I fear that I won't have any finger prints left after I've finished.

If it ain't broken don't try to fix it as if you do it will definitely break

I didn't realise you could do that with the mileometer, isn't that also illegal? You can always tell a clocked motor because after it's been altered the numbers will never line up properly. I may be thinking of more modern clocks though. Can I assume your trying to go all the way round back to zero using the speedo cable?

Hi Phil...Modern cars it is definitely a no no but my jube has had atleast 2 1800 speedo's in her (the second being 20,000 less than the first) plus I am changing/reconditioning virtually all of the running gear and want to start with the V8 speedo at zero to match-TBH if I were to send the speedo away for reconditioning it would automatically be reset to zero.

If it ain't broken don't try to fix it as if you do it will definitely break

Ah right I see, so it looks like you'l have to persevere with the thumb or send it for recon like you say. I've had a look through my info for the 'B' and I can't find anything about the speedo other than how to take it out and put it back in again. I agree with you about not taking it all apart as they are quite a sensitive piece of kit. If you bought a new one it'll be at zero, but that's more expense.

hi colin
try putting a needle between gaps on reels and click them round.