Amazing skills as always, Rick. Your work on the speedometers is amazing!
I'm curious if you've used one of those stabilizing tubes before and what you think of them. Like you, I have a really nice Airguide speedo with the stabilizing tube and pickup, but I've never had one on a boat yet.
BTW, I just sent you a PM regarding my Muskegon speedometers.
OK...so the retaining nuts can be easily fabricated. Looking through my junk drawer I found a couple of 1/8" brass compression nuts (...from a failed project over 30 years ago ...yes, I'm a pack rat.) When the small end is drilled out to .250" They're virtually the same as the Airguide supplied ones:
The only difference is that these are a fine thread and, because of that, are just a bit looser on the clear tubing on my test rig. They hold nicely on the actual air tubing though, and need to be turned on with a wrench. I've got a bunch ordered, so if I have your speedometer I'll send a couple back with it.
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I'd think that as long as the pickup is at least 2" below the bottom, and not in line with a strake, you should have reasonably undisturbed flow. These Airguide sheets have some general installation and care guidelines:
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I'll try a compression nut, it's going to take a good connection to stand that much pressure..
I wasn't thinking about the transom angle, it's close to vertical on the transom, a little bow up and it should be right on perpendicular to the water.
Wonder how much turbulence affects these? I would like to keep it as shallow as possible to reduce drag, I guess that will be trial and error.
Thanks, it will be nice to have a gage that I know is calibrated right.