cost to install engine analyzer (4 cyl)?

contact either EI or JPI, they can provide reasonable estimates for
labor time. this assumes, of course, that the person(s) doing the
installation are not using your aircraft as a learning experience.
Once you have the estimated hours, X $your shop cost = somewhat of
a reasonable $$ dollar estimate.

Also, check with a couple, three shops in your area (if there are
that many) for their estimate and familiarity with installing
an engine analyzer.