If you have an HEI distributor with a Tach Output you can use the Tach Output from the distributor. Due to the high voltage of the signal from the HEI you should use a tachometer filter to prevent damage to the tachometer. Coil Pack or Individual Coils (Distributorless Ignitions).
Yes, thyroid disease can affect your mood â primarily causing either anxiety or depression. Generally, the more severe the thyroid disease, the more severe the mood changes. If you have an overactive thyroid (hyperthyroidism), you may experience: 1  Unusual nervousness. 2  Restlessness. 3  Anxiety. 4  Irritability.
Thyroid cancer can cause several symptoms: 1  You may get a lump or swelling in your neck. 2  You may have pain in your neck and sometimes in your ears. 3  You may have trouble swallowing. 4  You may have trouble breathing or have constant wheezing. 5  Your voice may be hoarse. 6  You may have a frequent cough that is not related to a cold.