Hi
Getting the resistor out is easy with the right tool.
There is a hole in the resistor that you can hook with a wire with a 90 bend near the end.
I believe that the #5 is a happy medium.And yes you need the resistor.
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews