Pete,
I also installed an EI-VA1 volt-ammeter with the three-way switch for front, rear and battery current. I left the factory warning circuitry in place. I happen to have a picture of the shunt installation that I took when the front engine was out for replacement recently. You can see that I installed the shunts by stacking the front regulator on top of the rear regulator with spacers for cooling. I then made an aluminum plate with mounting holes that matched the regulator and attached the three shunts. I then built a bracket to hold the 6 required fuses.
My skymaster has de-ice boots, making firewall real estate very valuable. This was about the best layout I could come up with.
David
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