Sorry Guy's need more help again I would like to know what the diffance is beteen Electrical Gauges & Mechanical Gauges I want to use the dash pod with 3 gauges in it I Really would like to find one with 4 but only seeing 3 right now if anyone knows where to get a 4 hole one at PLEASE LET ME KNOW but want I really want to know is what one do I USE

Thank You

 

if your talking fuel pressure the mechanical will be cheaper and more reliable, and the electrical will be more expensive and easier to install. so take your pick.