JPI vs EI
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. . . .Just look at those wires.  What a freakin' mess.  That big bundle of braided wires, folded back and forth on itself, are the probe leads.  On a Traveler, I tied all those wires together and tried to make it look neat.  Can't be done.  I ran the wires all to the outside, firewall side, in an attempt to keep the wires from under the panel.  It helps,  But not much.  Also, ungrounded probes use the instrument itself as a reference temperature.   The braiding is needed on 'ungrounded' probes.  Not sure I'd trust 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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