Re: How to Hook Up a Sun Tach

[farna@xxxxxxx]

Unless the tach indicates it needs a trigger unit, the "trigger" wire is connected to the negative lead of the coil. I don't think it will hurt the tach even if it is a trigger unit type -- it just won't read right. IIRC the needle will bounce around a lot if it's the trigger type connected straight to the coil. The trigger unit basically filters the signal to keep the needle from bouncing -- the trigger unit connects to the negative lead on the coil. A bad non-trigger unit may have a bouncing needle too. If you need a trigger unit, I have no idea where you'd get such a thing. Sun may still have them, but you'd be better off getting a new tach. 

On January 17, 2006 mail@xxxxxxxxxxxx wrote:

> http://www.musclecartachs.com/docs/referencesun.htm  Is a web site that
> seems to deal with these tachs.  At a quick glance at this  it looks like
> this might have some  answers for you.
> 
> Good luck,
> ______________________________________________________________
> Ralph Ausmann  -  Hillsboro, OR - > <ralph.ausmann@xxxxxxxxx>
> http://mysite.verizon.net/res79g4m/ ... and "check the links"
> 
> 
> ----- Original Message -----
> From: "Jerry Phillips" <jnpvegas@xxxxxxxxxxxxx>
> To: <mail@xxxxxxxxxxxx>
> Sent: Monday, January 16, 2006 10:54 PM
> Subject: How to Hook Up a Sun Tach
> 
> >
> > I have an old Sun tach from the late '60s.  It is a model SST-802, which I
> think is the one that does not require an external sending unit.  I do not
> have any installation intructions or the harness.
> >
> > The two terminals are marked "Ign. Sw" which seems to be self explanatory,
> and 'Trigger.'  Where should I connect this?  One of the coil leads?
> > Thanks in advance,
> > Jerry Phillips
> > Las Vegas
> >
> > 68 AMX 390
> > 57 Chevy 283


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