Magnum Swap: Gauges and sensors

Background: I'm installing a 2001 5.2 Ram engine in a 68 Barracuda, keeping the original 904 trans. I'm using the Ram computer (PCM) and fuse panel/power distribution center (PDC). I'm keeping the original dash cluster with the analog gauges. The ignition switch has been completely rewired with the voltage supply coming from the PDC. I no longer have the underdash megasplice, fusible link or ammeter. Headlights, tail and brake lights are wired through the PDC. Instrument lights, heater fan, radio, wipers, etc are wired through the original fuse panel.

Looks like I need to keep the original temp and oil pressure sending units for the original gauges. I plan on converting the ammeter to a voltage gauge by replacing the movement.

I wanted to see where everybody else mounted the original sending units.

Also, do I need to install a battery temp sensor? What has everybody done about the speed sensor if using the original trans?