I left mine in. I purchased the premium package that includes RPM, CHT and EGT standard, plus five additional primary. All but one primary are displayed on the first screen and the FAA chooses which one goes on the second. I have MP, RPM, CHT, EGT, Oil Pressure, Left and Right Fuel on page one with Oil Temp on Page Two. All primaries indicated on the Master Caution and Master Alarm indicators. In addition to the primary I have five non-primary. OAT, HP, Amps, Fuel Flow, and Volts. In my case the fuel pressure was the odd man out. I could either install a EI FPL5 Fuel flow gauge which can accommodate a secondary input for fuel pressure or keep the existing MP/Fuel Pressure gauge. My installer swayed me toward keeping the Tach and MP for redundancy and to eliminate the need for an additional fuel flow gauge. In the end all the strip gauges are gone and the panel looks nice.