Q. I upgraded my MTC to a Siren 3 unit and do not see hardwired temperature or bilge- is this still an option?

Unfortunately, hardwired temp is no longer an option on the Siren 3 units. And is now strictly wireless. Hardwired bilge is an available feature...

Battery Switch/Hardwired Bilge Pump Input:  This input is designated to monitor EITHER the on/off position of a manual battery switch, or the activity of your bilge pump. 

To Monitor Your Bilge Pump: Connect the orange wire of Wiring Cable 1 in between the positive (+) fed float switch and bilge pump, or to a bilge pump indicator light. This input senses the presence of 12VDC/24VDC to monitor bilge activity.

APP SETTING: Select the “Siren” tab, select the three dots menu in the top right hand corner, select “Siren Settings”, select “Wired Input Preferences”, and then select if you would like to use this feature as a battery switch or bilge pump tile.