John - Q engines, as you saw, have 2 dimples on the flywheel. One mark is used on engines with right hand rotation and the other mark is used on left hand rotation engines. Both indicate the advance position (10 degrees on my engines), not TDC. It’s possible you’re trying to time a RH engine using the LH mark. Or vice versa. If you look closely you should see a R or L stamped next to each dimple. I’d try that first.

On the port engine it’ll be on the inboard side. Tucked behind the raw water pump. A few days ago I could have walked into my garage and gotten a photo for you. But the engines are back at the yard waiting to be re-installed. I don’t see an indication of the ohms on my wiring diagram (for my 1972 28’) but it calls out a 14 gauge black wire going to the sender.

On a Q engine it’s located on the right hand side of the block, forward, near the flywheel, and just above the oil pan flange.

I think that’ll work great. Thank you.

Thanks Tim. I’ll do the same thing.

Thanks Charlene. That’s the right stuff but what I failed to put in my post is that this is for the engine hatches. Looks like Jim’s parts are made for deck hatches and port holes. Right idea, I just need bigger ones. Hope to see you this summer.

Thank you Nathaniel. I’m seeing the same thing, damaged threads but no signs of rot. I’m so glad I bought a boat that was well cared for.

Thanks Lee. That’s what I’ll do then.

Thanks Sterling. My next trip to the boat I'll take an awl and do some poking around.