You will if you use that tap.Sorry, but what are you saying the long hex hollow rod is for? To clean the threads? I ordered a 1/2" 18 tap for the hole.
I really don't want to strip the block.
It's the wrong size, you can't easily measure pipe threads because of the taper.Why? Is it the wrong size? I measured the diameter and thread pitch of the bolt and that is what I came up with.
[snip] I ordered a 1/2" 18 tap for the hole. I really don't want to strip the block.
Pipe thread (NPT) is angled, so the further it's screwed in, the tighter it gets. A few threads left showing is fine... as long as it's tight. A bit of thread sealer is always nice, but just use a bit because the sender does need to get a good ground contact with the block.
When you say it is angled, do you mean the bolt diamater is narrower at the tip and thicker towards the sender? Or each individual thread is angled?
My bad... first one. From where the threads start to where they finish is tapered. IOW, the diameter of the pipe that's threaded is tapered. Take a look at the wiki ref posted earlier about NPT.
I just looked at the pic of your oil pressure sender above. It appears that the thread on the sender is not NPT (as it's not tapered), but it's known that the hole you are screwing into is tapered. This still works fine as long as the size and thread is the same.
Really, you can just screw the thing in till it's tight and you're good to go.
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