Bypassing the Amp gauge - Question about the MAD Electrical method

I've been reading up on this subject for a while now. Putting together a 66 dart convertible. Have headlight relays, and top motor relays or it and brand new harness' including engine dash and body. I will run a #10 shunt from the alternator to the hot/battery side of the starter relay. Is there any reason I would want to bypass the ammeter?
If there is, I guess nows the time. BTW, no huge stereo, electric fan or electric fuel pumps, pretty much stock.
What do you all think??