If I'm tapping into fuse for power for lets say fuel pressure gauge. Do you still have to add a inline fuse also? Or is that only when splicing into the wire?

 

The easy way to add power for some extra use is to use an 'add a tap' device that plugs into a fuse location, in place place of that fuse.
The device has two fuse holding sockets. One for the original fuse that completes the original circuit and the second fuse that protects the new circuit that you connect you new circuit wire to.
The new circuit fuse becomes seperate from the original fuse in that location.
Pick a fuse location that powers the new circuit at the right time such as nite lights from the dach circuits.
Alway fuse at a protection level about 10% above the current drawn, to have good protection from fire.
These are found at the electical displays in the auto stores

 

Yes I am going this route but I read somewhere that the add a circuit can only be used in a max 10 amp circuit. Is this true?

 

Not sure as I might have missed this point somewhere but you have to consider the feed capacity to the fuse location and not try to draw large currents that are better left to more specific wireing that will safley handle it.
I had assumed your gage would not draw that much unless there is more that you have not revealed in your original post.

 

Ok I see what you are saying. But Bluegrass can you now explain to me what do guys mean by piggy-backing? I kinda understand what it means but a detailed pic would make it a lot more clear. I want to do this when combining all my grounds into one lead and all my power for lights to one lead. I believe it will make for a cleaner install.Thanks for help... when it comes to wiring I'm still learning.