+3 CIRCUIT BOARD-ELECTRONIC-TACHOMETER-USA-75-77 (#E7138) 1C3' SKU 01612 $81.48 In stock Quantity: 1 Add to Bag Product Details Pre-tested and pre-calibrated for exacting accuracy. Includes a 15 turn adjustable potentiometer for extra precision and calibration, plus it has the original IC chip. Washers.... We don't need no stinkin washers.... Washer-less factory installation and a 1 year warranty. Save this product for later Favorite