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.