what should the compresion be on a used mercury tracer 1.9 fuel injection?

Answer 1

for a good running engine about 150 psi or more if its tired with a lot of miles thats running good and not using too much oil . Your readings (dry) within 15% from the highest to the lowest reading. If you do your wet test and it goes up more than about 20-30psi its tired.But will still run ok wih some oil consumption.

Answer 2

at least 140 psi.