I'm in the process of installing a Sun tach. When it came time to wire up the white wire from the tach in w/ the dimmer switch (so the lights in the tach would dim w/ the rest of the lights) I cut the light blue wire coming out the back of the dimmer and wired in the white wire w/ a splitter. <font color="red"> Did I get the right wire? </font color> That seems to be what Chilton's and Haynes were saying in their wiring diagrams. Sorry, I couldn't test it b/c I have an aftermarket distributor (Delco Ramy) and I don't have the connector that goes it to it (on order from Napa).