Wiring gauges, question about inline fuse

SN95StangMan

New Member
Jul 5, 2003
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Lynwood, CA
I was going to install some AM electric gauges in the A pillar in the next few days. Now, their instructions say to use a fast acting 3AG 4 amp cartridge fuse. Thats this kind:

View attachment 259513

My plan was to combine the wires that feed the power to the gauges and use a single wire to tap into a 12v source. MY questions are, what "size" fuse should I use for that, and also, can I use a fast acting mini blade type fuse instead.
 
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