Help with boost & A/F sensors

[SVTCruz]

Ok so this is my first time trying anything with electrical. I have the dual Aeroforce gauges and have had the 2.5 boost (requires 5v) and A/F ratio sensor (requires 12v) laying around. So i did research and read that I should use the add a fuse to get voltage for the sensor but I could not find a empty fuse slot that provides 12v during run. So I decided to probe around. With the picture on the left I found 14v and with the picture on the right I found 3v (but it changed every time I checked it).
My question is can I use either of these for the two sensors?

 

[ShelbyGT]

i didn't have an empty one either

i used the add a fuse in my fuse panel on fuse #55 or #56 i think. you just pull out the fuse, insert the tap/fuse combo and your good to go.

i've had it like that for over a year. it keeps the original accessory fused while adding one for yor new accessory

its basically piggy backed off any fuse that has switched 12v power

 

[workmangc]

Just to clarify, We are looking for a 12v source correct?

If so, why don't you just run a fused wire from the junction on the side of the underhood fuse box? It's a clean install, and you won't have to worry about overloading any other circuit or screwing up a sensor.

 

[SVTCruz]

I'm looking for a 12v and 5v source. First time doing this so i can use a lot of help

 

[workmangc]

There are plenty of 5v sources under the hood. A lot of sensors work off of 5v.

 

[ShelbyGT]

i used that little voltage reducer they (aeroforce) sell to make a 12v source into a 5v. it works really good and i like it better that tapping into sensor wires

 

[ShelbyGT]

but to answer your question. yes, you can us the 14v source gut the one that shoms up as 3v i'd be leary of. look around for a strong 5v source

 

[workmangc]

i used that little voltage reducer they (aeroforce) sell to make a 12v source into a 5v. it works really good and i like it better that tapping into sensor wires

This is probably the best idea.

This way if something shorts, you don't destroy anything such as the ECU.