Proform Billet Adjustable Timing Tab (PR67277C)ADJUSTABLE TIMING TAB LED With Built In L. E. D Timing Light Suit SB Chev 8" Balancer Part Number: PR67277C This billet aluminium timing tab has a built in self powered LED timing light or car battery hookup. Permanently mounted so there'sno need for additional timing lights. The hands free design allows one person to set timing!