Well, I've just bitten the bullet & bought an electronic tach to replace my completely cream-crackered ornament. I am now looking at the pretty installation picture & realize I have no clue as to how to connect! I have little electrical aptitude (am proud when I can identify which indicator isn't working).
Does anybody have any advice regarding installation or would anybody be willing to mentor me whilst I do this?I'd prefer the latter as I need to learn & I'd rather not fry this piece of kit.
I'm located near Newark, just off the A1& I'm sure that suitable reward could be arranged -
In hope, Mike, Mk III Commando
Mike, Presumably the Smith…
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Hi Chris, yesthat's the o…
Hi Chris, yesthat's the one & yes, hoping to have it in for Italy & MOT (along with a host of other jobs!), my late father was an electrician - unfortunately it always remained mumbo jumbo to me 
I thought perhaps I could utilise the existing tach lead (shown on the mk III wiring diagram, white & pink) topick up from the coil and feed to the headlamp shell. I should just be able to tap into existing lighting, but howto put the thing into the loom so it's switched on with the ignition is proving to be a challenge!
Let me know how you get on!
Mike
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Hi Mike, I presume you hav…
Hi Mike,
I presume you have the document that came with the tacho, this may look a little complicated but the only bit you need is the section called Tacho positive + earth systems.
The power feed to the tacho is via the black wire which goes to the ignition switch white wire.
Both the green and the red / white go to earth.
Now turn the ignition on and the tacho will sweep to full scale and back again. You now know the first bit is correct. (I am a great believer in one bit at a time)
The Red with black trace goes to the red / green that is going to your pilot light (and speedo / tacho light).
Now turn on the lights and you will see the illumination.
The next bit is to connect red/blue-bands to the wire between the contact breaker and the coils if you have standard ignition or the wire from the electronic ignition to the coils.
The final bit is the 'calibration' which involves the blue wire which you will need to follow the instructions for. You will be connecting it to the -ve side of the battery (the black wire).
Let me know how you get on.
Tony
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On my poor man's Manx (ES…
On my poor man's Manx (ES2) the needle often sweeps to 8 and back to zero when I put the battery on charge. The default for these instruments is set up for twins so that part is sorted for you.
A single has to go through 3,4,5,6,7 & 8 cylinder use before you get back to a single, pain in the butt!
Good luck.
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Mike,
Presumably the Smiths/Puca one?
I'm installing one here in the next few days then after a while I'll be testing it out so if you don't get any other offers, keep in touch and we'll see what can be done.
I'm assuming you want it going for Italy.