got an autometer boost guage its pressure not electric

gsrtype1

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2007 mazdaspeed3
got an autometer boost guage its got a pressure tube and a neg and positive wire for a bulb, could some help me on the install where do i insert the tube through the firewall? where to pu the positive wire , i looked at the thread on the elctrical sneor guage but mine is diff its pressur based so i have stick the tube throught the firewall where a good place to do this?
 
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