The Cylinder Head Temperature (CHT) - Tanis Adapter (Piggy Back) - probe, is installed in coalition with the Tanis Heating System. The CHT adapter probe will sit directly under the Tanis heaters, so that it may measure accurate and TRUE Cylinder Head temperatures. This probe can also be used to accommodate the factory supplied CHT probe as an adapter probe.
It works but reads a little low.
Yes because this is a secondary system.Therefore the stock probe must be there.