[Big-Foot]

One other thing about electric senders I've found over the years ---
The sender itself requires a good ground.
The only way to get a good ground to your engine is to NOT put any thread tape or sealant on the bottom 2/3 threads of the sender. That means the first threads that go into the block or adapter must be clean. This will give you a good connection. The sealant on the threads above that point will take care of any thread tolerance issues and seal them up.
The same holds true on any adapter fittings that your sender might be threaded into.