I had the same thing, so I swapped in default gauges from FSX aircraft into the "window00" section:
*****************
gauge00=b18_airspeed!b18_airspeed, 206,416,100,100
gauge01=b18g_3_combo!b18g_3_combo, 848,311,100,100
gauge02=b18g_dual_MP!b18g_dual_MP, 539,311,100,100
gauge03=b18g_dual_tach!b18g_dual_tach, 642,311,100,100
gauge04=b18g_cyl_temp!b18g_cyl_temp, 951,311,100,100
gauge05=b18g_R_engine3_combo!b18g_R_engine3_combo, 745,311,100,100
gauge06=Cessna!Altimeter, 448,416,100,101
gauge07=KingAir!Attitude, 326,416,100,100
gauge08=Cessna182rg!Clock, 121,490,70,69
gauge09=Cessna!Turn_Indicator, 206,534,100,99
gauge10=Cessna!Vertical_Speed, 448,534,100,100
gauge11=Cessna!Heading_Indicator, 322,534,110,104
gauge12=ST_D18!Rad_Compass_D18, 448,647,100,100
gauge13=ST_D18!oat, 115,665,70,69
gauge14=ST_D18!RMI_D18, 205, 647 ,100,100
gauge15=Cessna208!DME, 325,644,100,50
gauge16=Kingair_Radio!Adf, 929,632,88,96
gauge17=Kingair_Radio!Com1, 650,424,88,95
gauge18=Kingair_Radio!Com2, 929,424,88,95
gauge19=Kingair_Radio!Nav1, 650,527,88,95
gauge20=Kingair_Radio!Nav2, 929,527,88,95
gauge21=Kingair_Radio!Xpndr, 650,632,88,96
gauge22=Bendix_King_Radio!Bendix-King Radio Audio, 744,426,178,35
gauge23=Bendix_King_Radio!Bendix-King Radio AP, 744,461,178,55
gauge24=OMI_Bendix_KR22!OMI_Bendix_KR22, 327,375,100,34
gauge25=SimIcons!ATC Icon, 372,336,19,19
gauge26=SimIcons!Avionics Icon, 431,336,19,19
gauge27=SimIcons!ECU Icon, 411,336,19,19
gauge28=SimIcons!GPS Icon, 470,336,19,19
gauge29=SimIcons!Kneeboard Icon, 391,336,19,19
gauge30=SimIcons!Map Icon, 451,336,19,19
gauge31=Robinson_R22!compass_popup, 845,0,90,92
gauge32=Beech_Baron!Left Fuel Quantity, 744,689,69,69
gauge33=Beech_Baron!Right Fuel Quantity, 851,689,69,69
gauge34=Extra-300!Nav GPS Switch, 432,375,22,35
gauge35=cad_kln90bro!gpsro, 745,518,178,57
gauge36=Beech_Baron!Pitch Trim, 600,652,40,110
gauge37=, 562,552,63
gauge38=PITOT!PITOT, 112,576,36
gauge39=PROPICE!PROPICE, 147,576,36
***************************************
Okay, the digital ADI (attitude) is out of place, but it's better than nothing.

Hmm, looking at it, I must have messed up "gauge37." Ah well, must not have been important.....
