What sort of cap space is NJ even looking near the deadline? cap wages and puckpedia seem to have different numbers? It's hard to see NJ having enough cap to add an impact player.
It's hard to say because it's accrued daily, I think. So obviously the rate at which you're accruing it can change.
The two aren't far off in current cap space for the team (1.1 to 1.4), so I'd probably roll with something similar to puckpedia's deadline estimate. To be cautious, maybe round down from 3.7 to 3. But given the amount of time left in the season at the deadline, that should be more than enough to add an impact rental.