I'd start by tracing the extra wires that you'll find in the RA40 stalk. While the assembly will screw onto the RA28 column, you'll need to decipher the extra wires for the intermittant feature. I'd suggest you'll also need to change to the RA40 plug on both sides too, to accomodate those wires, and run them to their desination over the 28 loom. A multimeter will be your friend!
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