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300SD 1985-1981
a whopping 220% increase that totally eliminates failure at this point
1965-1967 GMC L3500
Port size - 2
MSD Tach Adapter 3550224-156-XXL 300SD 1985-1981If, after installing an MSD Ignition Control, your tachometer, fuel pump relay or electronic fuel injection (in foreign vehicles) doesn't operate correctly, your application may require a Tach Adapter. This is due to the trigger signal not being strong enough to trigger both the MSD and the factory's components. There are a few Tach Adapters available and for more information see pages 152 and 153. Each Adapter is simple to wire in and will have your
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