Volt/Ohm Meter measured values of Automer RPM Pills
rpm
3000 = 1880 Ohms
5000 = 3590 Ohms
5200 = 3790 Ohms
5400 = 3980 Ohms

From Darell
3000 = 1900 Ohms
5800 = 4400 Ohms
6000 = 4600 Ohms
7000 = 5680 Ohms
8000 = 6860 Ohms

To use round numbers (and only be off by 10-20 rpm), I determined the approximate formula in the 5000-6500 range to be:
RPM - 1400 = Resistance
or
RPM = 1400 Ohms + Resistance

So 
5000 rpm = 1400 + 3600, so I need 3600 ohms of resistance for 5000 rpm
5500 rpm = 1400 + 4100, so I need 4100 ohms of resistance for 5000 rpm
etc.

What I did was put a variable potentiometer (10K) in and set it to 3600 ohms (5000 rpm).
From then on, each ohm of resistance = 1 rpm added to 5000 rpm.  Units are now interchangeable.
The output from the pot goes to 3 of teh DIP switches.  They are 0, 500, and 100, so if one is selected, that output would then be 5000, 5500, or 6000 rpm.  That value goes into the other 5 DIP switches which have values of 100, 200, 300, 400, and 500.

The outut is then 5000 rpm (3600 ohms) PLUS 0, 500, or 1000 PLUS 100, 200, 300, 400, or 500.  That gives the opportunity for any 100 rpm increment from 5100 (switches 6 and 1) to 6500 rpm (switches 8 and 5).
5100 rpm = 6 and 1 (5000+0+100)
5800 rpm = 7 and 3 (5000+500+300)
6500 rpm = 8 and 5 (5000+1000+500)

To get the resitance values, I used a number of resistors (they add in series and divide in parallel) on a circuit board.  I put the whole thing in a small (~1.5"x3") box and cut the switch box out and a hole for the pot.  I then spliced into the two wires in teh shift light that go to the place where the pill plugs in.  I used copper phone line.  I ran the wires down the A pillar and out underneath the seat and place the box there.

Realistically, you could use 7 adjustable pots for the resistance values instead of resistors, or just use one pot and no switches or resistors, but you need a VOM to read the resistance everytime you want to set it.  I like being able to flip a switch at any time and change the light value.