5.7 swap dash questions.

This is what I did on my 6.1 for info.
Heater connections. The first photos is how I connected the heater lines to my core - but this is a factory AC car, so may be different than yours if no AC. The ends of the coolant pipes under the manifold were heated and bent into a position to connect to the core.
Coolant Temperature: The second photo shows where I installed the factory temp sensor (with a reducing bushing)
Oil Pressure: The third photo shows the stock sender screwed into a port my the oil filter.
Ammeter: Do NOT connect the hemi alternator output to the factory ammeter wiring in the dash. It is not designed for the high current flows (even the original stock wiring is marginal) I had my stock ammeter bypassed and converted to a voltmeter and the alternator output goes direct to the starter stud- not through the bulkhead connectors
Jim
https://www.forabodiesonly.com/mopar/threads/srt8cuda-build.218445/
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