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.
Depression, the thyroid and hormones. Depression is a common symptom of an underactive thyroid, also called hypothyroidism. A doctor will want to rule out other causes of the depression, and diagnosis of underactive thyroid may be reached once other symptoms have been explored, such as tiredness and weight gain.