Anyone have an over the counter source for a 12V "shunt" to prevent pinning/damaging my Amp gauge?

Followed a few threads, did some web searches, saw mention of a factory Chevy "shunt" but no part number or description that local parts stores could work with.

Tried asking at the parts counters, saw the perfect illustration of the term "Blank Stare"!

Google just comes up with parts for solar panels. headscratch

Found a link to instruction for building a shunt, http://millpower-race-engineering.piczo.com/?g=43218292&cr=5 , but Radio Shack cannot supply the necessary resistors. dang

My Amp gauge works, but I prefer not to overload it via the alternator and heavy loads.


1957 Chevy 3600

At these prices I want my gas 100 octane, leaded, and my windshield washed!