D120 and engine RPM - beginner level questions

[Battson]

Hello Dynon Support,

So I received my engine sensors package for my injected 540 Lycoming, which is all good - very nice gear and very well packed. Lovely.  I now realise there is no RPM hook-up equipment provided, which surprised me seeing as it's the most basic engine measurement. I guess it's a pick your own probe kinda deal...

I read the manual, and see I have some options. The problem is I dont really understand them in enough detail to choose.

I want a simple and cost effective install, so the P-lead hookup sounds good - but I have some quesitions:

Do you simply splice a wire directly into the P-leads somehow, with a resistor at the lead?  I'm not sure where I can get resistors from, or more importantly how to wire them in-line such that the connection wont fatigue and risk creating a dangerous "hot mag"? 
I have the 6-cylinder Lycoming which apparently needs extra resistance?  It seems like it would easy just to throw a couple of extras into the sensor kit (seeing as I ordered the 6-cyl. Lyc. kit?), they cost next to nothing - in fact the manual actually says there will be 2x 30kOhm resistors included at least, but I couldn't find any in my kit??  :-/

Are there any other downsides to this P-lead method?
I have been told the RPM can lag when doing mag changes if you use the P-lead method - Does this lag exist or is that a myth?

And I guess the other option is to import a transducer/sensor of some kind (I'm in NZ). I dont know much about these as I didn't know I'd need one - can you please recommend a reliable & cost effective brand commonly available (e.g. Aircraft Spruce) in case I can't find the resistors I'm looking for?

Thank you kindly for your advice,

Jonathan

(Edited for spelling and grammer)

 

[Battson]

Ok - I owe the Dynon packing department an apology. I found the resistors shipped with the D120, not with the sensors.

Is the best way to install these with solder, or with crimped butt-splices?
The stub sections of wire don't really lend themselves to either option, and I wanted to know what a robust, reliabily connection method is?

 

[Dynon]

There are a few ways to connect resistors inline. You can butt-splice, attach other connenctors, and more. We like this style: http://www.704ch.com/2012/06/electrical-skyview-network-starter.html - bottom two pictures. You wrap/solder the wires in parallel in the "wrong" direction, and then heat shrink the whole thing. This puts the strain relief load on the wires themselves, and doesn't tension the resistor body/resistor's wire junction, which tends to be brittle anyway.