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Old December 28th 10, 12:16 AM posted to
Bruce in Bangkok[_16_] Bruce in Bangkok[_16_] is offline
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First recorded activity by BoatBanter: Aug 2009
Posts: 321
Default VDO tachometer-hourmeter with bad display

On Mon, 27 Dec 2010 11:30:40 +0100, Dino

On Tue, 21 Dec 2010 15:18:58 +0000, Nigel Molesworth

On Tue, 09 Nov 2010 16:37:26 +0100, Dino

Hany suggestion or link?

Thaks for the link.

The above link do not show any details about wiring

I have decided to progress with a separate hourmeter and
leave the original tachometer only for the RPM display.

The reason is because of the uncertainty of hourmeter
connection. The VDO is connected to the motor with two wires
that carry the RPM pulse. It is my believe that RPM pulses
are internally analyzed to originate the "motor running"
information to the original hourmeter.

I'm progressing with a mechanical 12V hourmeter and a small
12V relay connected to the alternator output.

Why not just wire it directly to the "ignition switch"? When the
switch is on the hour meter runs, when it is off it doesn't.