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Posted for "Leighton" <leighton@teleport.com>:
The single wire transducers are easy to install and hook up but properly
grounding them is important and tricky if they're not mounted directly to the
engine, which is not a good idea. What works for me is to make a simple
manifold/mount which is then connected to a good ground point. The attached
photo shows one I did with just a bandsaw and drill press, which pretty much
comprises my entire machine shop. The ground wire, black, is attached under a
mounting bolt with a ring terminal. If a transducer is already mounted via an
adel clamp, try stripping and inch or so of wire and folding the bare end a
few times and capturing it between the rubber part of the clamp and the
transducer body. Not very elegant but it should tell you if a proper ground
will solve the problem. I agree that teflon tape is not to be used on the
pipe threads of the sender but I use a very thin film of teflon paste on the
threads to act as a sealant and prevent galling. A continuity check after
installation assures that good electrical contact is being made. Works for
me.
Leighton Mangels
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