Hy boogerdave, I'm not expert on resistors, it always gave me a headache in school. I believe the gauge (90 ohm) works on a zero to 90 ohm range, so if you put a 48 ohm resistor in the circuit the best you could hope for would be a range of 48 ohms to 90 ohms, so the gauge would never function correctly. I'm sure someone with more expert knowledge will be along to confirm or poopoo my statement.
