After adding 1 more, you will feel some more diff. You will like it. 

haha, i would prefer talking in this way:

A digital volt meter is for your eyes, you do you want it to be on the VS which is then hiding in engine bay and you only get to see it once in a while for e.g. during washing your engine bay?

I would recommend to get a voltmeter that plug into your cigarette head or direct connection to wires under your dash. Wow like this, while you rev your car, idle, air cond kicked in you will be able to monitor it almost realtime.

yup alternator grounding is great companion with my vs, u know what grounding cable will maintain ur alternator voltage at max level n doesn't go lower when engine gets hot, while vs flatten out sudden voltage drop during high demand

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Added on May 2, 2010, 11:18 am
Alternator to -ve batt terminal

more or less will help, just buy 1 thick cable for alternator, around 30 good quality