From Vref = 5V to RHI = 1.5V: Use voltage divider between pin 7 and ground, middle to pin 4. Choose Rtop = 10 kΩ, Rbottom = 4.285 kΩ (approx 4.3k).
( R_\textset = 12.5 / 0.015 = 833.3 \ \Omega ) → use 820 Ω. LM3915 Calculator
[ V_\textin,peak = \sqrt2 \times V_\textrms ] From Vref = 5V to RHI = 1