most guys install the gauge adapter in the spark plug thread port and hit the starter letting it run thru a couple revolutions
what your looking for is no so much the psi value as the difference between the cylinders readings
lets say you get 155 psi (about average on current street cars) and several cylinders read 155 -160 but several read 90 psi, its an OBVIOUS PROBLEM
read the LINKED INFO
http://www.harborfreight.com/cpi/ctaf/d ... mber=95187
http://freespace.virgin.net/tommy.sandh ... ession.htm
http://www.geocities.com/dsmgrrrl/FAQs/compression.htm
http://autos.yahoo.com/maintain/repairq ... 056_1.html
http://www.aa1car.com/library/compression.htm
what your looking for is no so much the psi value as the difference between the cylinders readings
lets say you get 155 psi (about average on current street cars) and several cylinders read 155 -160 but several read 90 psi, its an OBVIOUS PROBLEM
read the LINKED INFO
http://www.harborfreight.com/cpi/ctaf/d ... mber=95187
http://freespace.virgin.net/tommy.sandh ... ession.htm
http://www.geocities.com/dsmgrrrl/FAQs/compression.htm
http://autos.yahoo.com/maintain/repairq ... 056_1.html
http://www.aa1car.com/library/compression.htm