(13)   Connect push button glow plug to glow plug wire assembly at push button (42). (14)   Connect two wire assemblies from compressor  oil  pressure  switch  (8)  to  load switch  (39)  and  from  unloader  control  box to load switch (39). (15)   Connect  starter  to  ammeter  wire  assembly at ammeter (2). (16)   Connect     stater     to     master     switch     wire assembly   at   master   switch   (21),   connect the    compressor    oil    pressure    switch    to master switch wire assembly at the master switch (21). (17)   Connect starter to start switch wire assembly at start switch (20). (18)   Connect engine oil pressure hose assembly (19,  Figure  8-30)  at  connector  (13,  Figure 8-8). (19)   Connect    compressor    oil    pressure    hose assembly  (28,  Figure  8-10)  at  elbow  (10, Figure 8-8). (20)   Connect   the   mechanical   filter   and   drain valve/dehydrator  bleed  valve  to  automatic drain valve tube assembly (24, Figure 8-39) at  elbow  (35,  Figure  8-8).    Connect  tee  to drain  valve  tube  assembly   (41,   Figure   8- 39). (21)   Connect the drain valve to mechanical filter tube   assembly   (23,   Figure   8-39)   at   the mechanical filter. (22)   Connect    the    ten-micron    filter    to    service valve    tube    assembly    (9,    Figure    8-2)    at elbow  (28)  and  the  service  valve  at  elbow (26, Figure 8-8). (23)   Connect 4th stage cooler outlet to mechanical filter tube assembly (22, Figure 8-39).    Connect  the  4th  stage  cooler  inlet hose  assembly  (21,  Figure  8-39)  at  elbow (11, Figure 8-10). (24)   Connect  3rd  stage  outlet  to  3rd  stage  trap tube assembly (15, Figure 8-39) at connector  (13,  Figure  8-10).    Connect  3rd stage    cooler    inlet    hose    assembly    (14, Figure 8-39) at elbow (15, Figure 8-10). (25)   Connect  2nd  stage  air  cooler  outlet  to  2nd stage  trap  tube  assembly  (9,  Figure  8-39) at  elbow  (21,  Figure  8-10.    Connect  2nd stage outlet to 2nd  stage  cooler  inlet  hose  assembly  (8, Figure 8-39) at elbow (19, Figure 8-10). (26)   Connect cylinder 1 to 1st stage cooler hose assembly   (1,   Figure   8-39)   at   elbow    (8, Figure  8-10).    Connect  1st  stage  cooler  to 1st  stage  trap  tube  assembly  (2,  Figure  8- 39) at elbow (22, Figure 8-10). 6-11. Instrument   Panel   Assembly   (See   Figure   8-8). The following paragraphs contain disassembly, cleaning, inspection, repair or replacement and assembly instructions for the instrument panel assembly. a. Disassembly.  Disassemble the instrument panel assembly   only   to   the   extent   necessary   to   repair   or replace a defective part or parts. (1) Loosen  and  remove  hour  meter  (1,  Figure 8-8)  mounting  nuts  and  clamp.     Remove the hour meter (1) from panel (44). (2) Loosen and remove ammeter (2) mounting nuts  and  clamp.    Remove  ammeter  from panel (44). (3) Disconnect    service    pressure    to    service outlet tube assembly (5) at service pressure gauge elbow (7). (4) For   the   compressor   pressure   gauge   (3), service pressure gauge (6), compressor oil pressure gauge (8) and engine oil pressure gauge   (12)   remove   nuts   and   clamps   on each gauge, remove gauges from the front of the panel (44). (5) Disconnect  service  outlet  to  service  valve tube assembly (14) at service outlet (16). (6) Loosen and remove jam nut (15) from rear of   service   outlet   (16).      Remove   service outlet (16) from panel (44). (7) Unscrew   and   remove   nut   securing   wire assembly     (17)     to starter switch (20). Remove   wire   assembly   (17)   from   switch post. (8) Remove   nuts   (19)   and   screws   (18)   from start    switch    (20).        Remove    the    starter switch. (9) Loosen   and   remove   lock   nut   on   front   of master  switch  (21).    Remove  switch  (21) from rear of panel (44). 6-12