I ohmed a dual one (high miles) & got 1.6/6 & I wired them parallel & got 1.1 ohms. I wouldn't b araid to use the Accell one & dont think you'd have a prob w .5 ohms. What's the value on the other half of it? info from a prior thread: ign coils are either .5 or 1.5 ohms (pri). Most aftermarket performance coils and early chrysler coils are .5 ohms. the ballast turns .5 ohms into 1.5 ohms because .5 ohms will overheat the coil. E coils are .5 ohms but will not overheat. Chry ECU type coils or aftermarket coils you must retain the ballast. Late coils like on lean burn are 1.5 ohms & can use WO ballast.