I wouldn't. You will get a better real world reading hooking it up to the radio feed wire or fuse box. be sure it is a switched hot wire...not constant hot. A volt meter works with a small wire, an Amp gauge uses thick wires
Because the gauge will be working 24/7 and it will kill the battery. Not all fuses are hot all the time...some are hot only when the key is switched to ON or ACC
I have mine connected to the supply for the seatbelt light that orig mounted under dash, long since MIA... Due to voltage drop in the wiring it no doubt reads a ½v or so low, but I don't really care if it reads 14 or 14.5v when charging... Either way I know alternator is working...