Carbon monoxide and propane sensors

[Gardner Yeaw]

The original sensors in my coach are not working. I want to install
modern sensors but I am trying to decide if centraly locating single
units would be suficient or if installing two of each (one pair forward
and one in the sleeping area) would be necessary.

On another note, is it possible to rejuvinate the existing sensor
system, which I believe has multiple sensors nearer to the possable
sources? Or is there a system available with remote sensors to replace
the original?

Gardner
78FC33