MSD Ignition Tachometer/Fuel Adapter Features: Correct Operation Of Voltage Triggered Tachs Use Current Trig.Tachs In Line w/Ignition Switch Easy Mounting And Installation Great For A Mag Pickup Used To Trig. MSD Ignition Height: 2.50 Width: 9.50 Length: 5.50 Weight: 0.70 lbs Vehicle Type: 2715