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.
Baseline thyroid function tests should be measured prior to starting lithium therapy to ensure that undetected hypothyroidism is not contributing to mood symptoms. Pertinent thyroid function tests include TSH and free T4 levels, as well as antiperoxidase and antithyroglobulin in the presence of an elevated TSH.