Dash Power wire?????

ok i checked what the aftermarket guage was it said amps, so it is a amp guage. I'm so confused on how the main dash power got to the cluster it went threw a ammeter...what is that :silent: ???? i need like 101 basic stuff here i got some pics of some stuff.

here is the wire that went to the aftermarket amp guage
http://img335.imageshack.us/img335/2796/wire32ub.jpg

ok i was gonna post some more pics but imageshake decided to go down at this minute :cwm10: but ya i'm drowning is about how i put it :sad9: