...work for you?
It's a second probe that fits in the screw in adapter for the regular CHT probe. They are made for certified planes to allow a non-TSO'd 4/6 channel CHT monitor to be used without changing the location of the airframe required existing single CHT probe
You would need to check that they are the the correct type and grounded/ungrounded, but several of the CHT/EGT monitor manufacturers make similar items, one should work.
http://www.aircraftspruce.com/catalog/inpages/gem5.php