somewhere I stumbled upon on the net yesterday, it said that if you had HEI that some tachs wouldn't give an accurate reading. Is this true? I have an on cheapy sunpro tach on my old '66 truck that just attaches to the negative side of the coil. I was considering taking it off that truck and putting it on the burb, attaching it to the "tach" terminal on the dizzy. So will this tach work correctly. The thing I read said that even if the tach was giving you a reading, some tach's simply wouldn't be accurate with this type of distributor. If this one won't work, what will? thanks.