I have two nearly new Aetna digital tachometers for sale.
These are for diesel engines. Part number is 8402-R-B-DS (red LED, black bezel, diesel)
I mistakenly bought these for my flybridge, but LED readout is not ideal for outside/sunlit areas.
I already have Floscans inside in the pilothouse, so I don't have use for them there.
These are nearly new in that they've been installed for just a few hours.
They are easily adjustable to any diesel engine with dip switch settings on the back of the gauge.
$200 each (normally $262 each)