Tach sender replacement?
[EDIT: we think we found the problem part and are now looking for a replacement - see post #2]
We thought we had this sorted after an earlier occurrence - we had found a couple loose nuts on ring terminals and spent some hours cleaning up the wiring harness, but...
We have two tach sensors - one on the mag which goes via an RDAC on the engine side to our MGL EFIS, and one mount-on-the-engine type that goes to a round gauge.
After landing today (not a hard landing, either...), we taxied off the runway, and both tachs dropped to exactly zero and stayed there, though the engine kept on running normally. Other than a running engine, what things might be common to both sensors? All I can think of is a power bus connect point or a ground bus connect point.
[EDIT: we think we found the problem part and are now looking for a replacement - see post #2]
We thought we had this sorted after an earlier occurrence - we had found a couple loose nuts on ring terminals and spent some hours cleaning up the wiring harness, but...
We have two tach sensors - one on the mag which goes via an RDAC on the engine side to our MGL EFIS, and one mount-on-the-engine type that goes to a round gauge.
After landing today (not a hard landing, either...), we taxied off the runway, and both tachs dropped to exactly zero and stayed there, though the engine kept on running normally. Other than a running engine, what things might be common to both sensors? All I can think of is a power bus connect point or a ground bus connect point.
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