I did this this morning. I used a polo 25 tube with a k7000a chasis. The ohms on the wells tube was 1.5 and 9.8 the ohms on the polo tube were 1.6 and 5.6. I did not change the yoke just had to snip the degaussing wire and the yoke wires to use the wells Gardner style connector. The wire colors were all different except for the brown on the yoke wires so make sure you keep them straight and not mix them up or you get magic smoke (buffet uses this term)