Check the listing for details. Mercruiser V6, V8 Thunderbolt Distributor, Sierra Ignition Pick Up Sensor. Condition: New. Listed at 83.25 USD. Sierra Ignition Sensor for Mercruiser This is a brand name (Sierra). Not a generic sensor thats going to stop working a month later. Fits Thunderbolt Ignition V6 & V8 1981-1997 Replaces:Mercruiser Ignition sensor# 87-892150Q02, 87-861780Q4 & 87-861780A2 Mallory 9-29804 Sierra 18-51161 & 18-5724 This Sierra ignition sensor is for in your distributor(for the people that might not know). This new ignition sensor has an extra (ground)wire compared to the original because the original had grounding issues which caused early failure. We sell Tools and other parts in our Ebay store Visit My eBay Store: Whoya Products THIS ALWAYS SHIPS OUT NEXT BUSINESS DAY. MOST DAYS WE CAN GET IT OUT THE SAME DAY. THIS SHIPS OUT USPS WITH A TRACKING NUMBER. THE TRACKING NUMBER WILL SHOW UP IN YOUR EBAY BOUGHT ITEMS, JUST CLICK ON IT TO TRACK. WE HAVE THE BEST/FASTEST SHIPPING AND BUY IN CONFIDENCE AS WE HAVE A 100% FEEDBACK RATING. THANKS FOR LOOKING.