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#1
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Yep, the instrument cluster was AD'd for additional cooling. Might want to check to make sure there is air being blown on them. Scat tubing tends to get broken and old, might need to be replaced or connected to the firewall
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Herb R Harney 1968 337C Flying the same Skymaster for 47 years 
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#2
08-01-20, 09:01 AM
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Cooling
Herb is correct about AD modification. The cooling air from the ports on side of fuselage cools your avionics, And on left side there should be a small ‘y’ that takes air from that cooling line and takes air up to gauges. I have installed an instrument cooling fan and run a dedicated hose just to those engine gauges.
Jeff
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