[BILL WILLIAMSON]

I once had a whistle with a rubber hose to pop onto compression guage adapter. It had a LOW note as piston slowly came up on compression. After it reached TDC, it changed to a HIGH note! Great fun when you were able to rock it back & forth! Somewhere, I saw a supplier selling a timing pin "tool" that made a "click" when the dimple hole arrived at the "scene!" Bill W.