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.
1 Goiter - enlargement of the thyroid gland. 2  Hyperthyroidism - when your thyroid gland makes more thyroid hormones than your body needs. 3  Hypothyroidism - when your thyroid gland does not make enough thyroid hormones. 4  Thyroid cancer. 5  Thyroid nodules - lumps in the thyroid gland.  Thyroiditis - swelling of the thyroid.