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post #1 of 10 (permalink) Old 09-11-2014, 03:43 AM Thread Starter
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seven tach and others

Trying to figure out how to wire the tach. Does one lead go to the coil and the other to ground? If so, looks like the coil wire also goes somewhere else but do not know where.
Any part that can substitute for a swirl pot- mine has perforations everywhere and cannot locate another.
Any subs for speedometer cable?
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post #2 of 10 (permalink) Old 09-11-2014, 09:19 AM
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Show us a picture of the back of your tach and we can be more help.
There's possibly a wire, usually white, from ignition switch to tach, which goes "through" the tach and on to the coil. It acts both as a sensor for the tach and to energise the coil when you switch on. There's a black wire for ground.
There are also wires for the light in the tach.

But that's only one type of tach - tell us what kind it is if you don't have a picture. If it's original it will be written on the dial, at the bottom.

You may be able to get a cable from Speedy Cables in the UK, and a Swirl Pot from Axminster Panels (Andy Wiltshire) also in UK.

'67 Elan S3
'72 Europa TC
'05 Elise
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post #3 of 10 (permalink) Old 09-11-2014, 11:53 AM Thread Starter
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It is the original with the white wire coming from the coil. Will hook up to ignition switch and see what happens.
Sent an email to Andy for the swirl pot.
Appreciate the input!
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post #4 of 10 (permalink) Old 09-12-2014, 06:33 AM Thread Starter
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looks like the white wire is coming off the (-) pole of the coil and connects to the tach but the wire is not stripped, only wrapped around the pole. The tach does not work- is this supposed to be exposed with direct contact.
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post #5 of 10 (permalink) Old 09-12-2014, 10:28 AM
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Quote:
Originally Posted by Newtoit View Post
looks like the white wire is coming off the (-) pole of the coil and connects to the tach but the wire is not stripped, only wrapped around the pole. The tach does not work- is this supposed to be exposed with direct contact.
May require more than one loop.

Cheers,
Kiyoshi

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post #6 of 10 (permalink) Old 09-13-2014, 01:31 AM
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Is your car positive or negative ground?

'67 Elan S3
'72 Europa TC
'05 Elise
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post #7 of 10 (permalink) Old 09-15-2014, 04:41 AM Thread Starter
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positive ground.
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post #8 of 10 (permalink) Old 09-16-2014, 04:26 AM
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So the white wire comes from the ignition switch, around the pole on the back of the tach (maybe 2 turns) and then to the - post of the coil. It shouldn't be stripped anywhere.

'67 Elan S3
'72 Europa TC
'05 Elise
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post #9 of 10 (permalink) Old 09-18-2014, 04:36 AM Thread Starter
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ran the white wire from ignition through the tach to coil. Car runs fine, but tach still not registering. Any clue on how to test the tach or recalibrate?
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post #10 of 10 (permalink) Old 09-19-2014, 03:40 AM
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Originally Posted by Newtoit View Post
ran the white wire from ignition through the tach to coil. Car runs fine, but tach still not registering. Any clue on how to test the tach or recalibrate?
That's not the only wire you should have. The white wire reads the signal, but there should also be a wire, usually green, that supplies the power to the tach, and another, usually black, that goes to ground. The terminals on the back of the tach are usually quite obvious. Sorry I forgot to mentin the green wire in my earlier reply.

'67 Elan S3
'72 Europa TC
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