Cant find drive, OS install questions. Im stuck.

BACK INFO.

Mac $@$* the bed one day, cant see HD in recovery mode but could see SSD

I just finished replacing the HD with a brand new 4TB, I also installed the heat sensor as per recommendation.

I boot into RECOVERY mode and all I still see is my SSD in disk utility

If I select restore from back up or install OS it doesn't show the new HD or the SSD

SO NOW WHAT?

Can I install the OS onto the SSD from a memory drive so the computer can be usable even if I cant get the HD working? ( I saw it wont let me patition the SSD, but I can erase and format it. If I do that in recovery mode wont it remove the RECOVERY mode from the SSD ?)

Do I need to do the memory drive OS install to find the Hard drive?

Do I need to remove the heat sensor all together?

Im literally back to where I started before opening up my IMAC.