Boost Gauge..help

you will want a 3 bar model. the 2 bar will max out at 14.7 psi. a mechanical gauge relies on a vacuum/pressure signal running through a line from the manifold to the gauge. an electrical gauge reads pressure from a switch or sending unit that is plumbed to the manifold rather than running a line. you will likely see smoother gauge activity with an electrical gauge over a mechanical gauge.
 
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