So more options (dual EI)
stewartj said:
The sensor is installed in ONE magneto. The sensor counts the RPM of the internal working parts of the engine and displays the RPM on the indicator on the panel. I have better described this for you. If not I would be happy to try again. GOOD LUCK!!!
John RV-6A 800 hrs RV-10 100hrs
Good for you John, good info on the VM-1000c. I am not 100% what you mean about "internal working parts", but it sounds like you need at least one traditional magneto. Many folk are running dual EI. I guess I am a little turned off by the idea of modifying the Magneto.
Good info lets recap the ways to get around a switch for selecting a Tach input with electronic engine monitors:
1) use a tack drive independent of ignition. Type of engine monitor does not matter.
2) Have at least one E/P-mag, which always sends tach signal even while ignition spark is off. Type of engine monitor does not matter.
3) Dynon has a way to handle two separate inputs, mix match. It does not matter what ignition you have. I don't know if it can mix two tach signals from different types of ignitions like a Mag and EI (?).
4)Dual Lightspeed III (models since 12/2005) sends a coordinate signal from the two units. Type of engine monitor does not matter.
5) VM-1000c uses a modification to regular magneto for signal independent of P-lead. Requires at least one regular mag.
I have a GRT EIS 4000 so it takes one input. I have not decided on an ignition but my first choice is dual Lightspeed II's. That is why I went with the mechanical tach sender. Simple no switches and does not rely on the ignition at all.
It seems like it would be easy to make a little electronic module which can take two tach inputs and mix or switch it to one output signal. Any electronic experts out there who can make a little board to do the job for those who don't have a Dynon, E/P-mags or a VM-1000c with magneto ignition?
George.