I have been considering this swap. Its a turn off to me that the batt light would no longer function, but what kind of voltages are you running after the car warms up? Is it necessary to turn up the PWM controller to make the voltage sit where you want it when the car is warmed up? I know mine drops off considerably(only runs low 12v) when its warmed up all the way. You are also up north though in a cooler climate.
-Rob
-Rob