JPI vs EI
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. . . .JPI uses just the thermocouple wire without a braided shield on their "grounded" probes.  Makes a nice, clean, simple installation. 
I trust the individually grounded probes more than the ungrounded probes.

EI Unit:
EI wires (01):
EI wires (02):
EI Firewall side:		 w/ ONLY the EGT and CHT wires
This is under the panel
This is also under the panel
EI wires before being tied together		 JPI Unit:
JPI Wires:
JPI Firewall side:
Top View:

w/ CHT, EGT, Fuel Flow and GPS data wires
The yellow cable is almost all of the wiring for the JPI
This is on the outside.
Another view on the outside.

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