Signal Stabilizer for Tachometer For use with AT-Series Alternators when the Tachometer does not provide 3-pole alternator output recognition. This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns. Specifications: Box Dimensions: 3"H x 5"W x 6"L WT: 0.35 lbs UPC: 676205000659 Brochure (pdf)