meters that are used for either oil pressure, oil temp, water
temp, vacuum, voltage, boost etc......
popular brand is Defi, but there are other types like SLM (smoke
lens meter), autogauges..... etc.
why its there ? Some need it- in turbo cars esp, some don't need it
but want it, some just like it for its cool factor
Can look around for DEFI at ST power, or enquire in workshops like
BMS.
SLM can find at Mc Well.
Pricing from few hundred to 1k+ for DEFI 