boost and fuel press guage
Id probably get confused in your car. you like to keep it low on the outside though i see 
lol, not really a whole lot in my interior. Just boost & fuelpressure on the a-pillar (which have low & peak recall on), boost, water temp, oil pressure on the dash pod (if you are wondering why i have 2 boost guages, i read boost coming straight out the blower, and read boost at the intake to see if there is any loss), dual bank air/fuel meter(which is just as useless as autometer a/f guages..im just too cheap to buy two Wideband setups
), timing adjuster (which allows me to pull or add initial drive timing, and pull/add timing under boost), and a my 2 speed fan controller. 
