The other lead goes to one side of the coil, though I forget which side -
obviously negative or positive, but I can't remember which one. It measures
by the expanding collapsing of the coil charge field as opposed to right of
the high tension lead from the coil to distributor. What I can tell you, is
most analog will take a quick bump in the opposite direction, so if you hook
up the ground, and touch to neg or pos on the coil with the engine running
and if it deflects in the correct direction you're okay, wrong way then
remove immediately! or you will damage the meter. Not a good recommendation
but if you are quick and in a hurry ... otherwise usually a tune-up book for
any older car well tell you which is correct.
HTH
Rick Gregory
'74 Spitfire 1500
Great Falls, Montana
http://www.geocities.com/spitfire74us/index.htm
-----Original Message-----
From: James Carruthers [mailto:j.carruthers@rave.ac.uk]
Sent: Monday, December 31, 2001 6:57 AM
To: Spitfire
Subject: Tacho
I've found a tachometer (?!?!) which also does dwell angle stuff. Its an
analogue unit with a needle.
I don't have any instructions - it has 2 leads - negative and positive.
But where am I meant to connect it? I'm guessing the black gets grounded -
but
where does the red one go. My guess is on the coil to distributor cable -
but
how would it connect to a covered cable? I dont want to try it out in case I
blow the thing up. Although I am now ready for a fire - as I got a fire
extinguisher for christmas - a rather unusual present. I hope I never have
to
use it.
(I have electronic ignition if that makes any difference)
Happy New Year,
James
1977 Pimento Red Spit
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