Dave:
My 73 P337 has a GEM 1200 unit. There was no DER involved. The GEM came with an STC. It was installed by my shop and signed off by the AI at the shop. I don't remember the pathways used to run the wires, but I am going into annual inspection in February, and I can check then if you need me to do so.
I also installed a Shadin Fuel Flow system. Same deal...just installed in under the accompanying STC. I know that on that installation, the mechanics were able to get the transducer wires through an existing grommet hole with other pre-existing wires.
I'm not too familiar with the JPI system, but I would assume that it also has an STC. If so, I would think that all of the calculations have been done as part of the STC.
Mark
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Mark Hislop
N37E
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