Jeff,
I have used the Vans relay board on 4 installations so far and no problems. I do have a recommendation for you, just for safety. If you have a unfamiliar co-pilot you don't want him/her messing with anything that will affect the flight of the AC. What I do is to install a DPDT switch on the panel and lable it "Stick Select". Very easy to wire, Infinity has all the common's seperate for their switches. Take the Flap common and the trim common from the hat switch and wire them to the NC and NO of the stick select switch. For example the left stick to the NC terminal and the right stick to the NO terminal. Now the common terminal wire to Ground. So the same for each stick for the common wire for the hat switch.
What this does is to remove the ground return for both the flap control and the trim control, and isolating the stick from those systems.
As for remote starting I use the Vans pressure switch and a cheap automotive horn relay for that control. One word of caution, if the oil cooler is located on the FW this doesn't work very well with Vans pressure switch.
I have encountered a situation where after a few bladed the pressure switch will open. because the oil system is charged and normal cranking will produce enough pressure to open the switch. In this case a adjustable pressure switch will be required.
Hope this helps,
John H.
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