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I've always done compression tests with all the plugs removed for two reasons. First the tester screws into the spark plug hole so removing them makes sense and second the starter can spin the engine more easily with them removed so the readings are usually more accurate.
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Email me about 911 exhaust stud repair tools, rsr911@neo.rr.com
1966 912 converted to 3.0 and IROC body SOLD unfortunately 
1986 Ford F350 Crew Cab 7.3 IDI diesel, Banks Sidewinder turbo, ZF5 5spd, 4WD Dana 60 king pin front, DRW, pintle hook and receiver hitch, all steel flat bed with gooseneck hidden hitch. Awesome towing capacity!
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