I just installed a 12v fuel gauge I purchased from Classic Parts and installed nothing between the gauge and the cluster back. From what I’ve read in this forum, the gauge is grounded by touching the back of the cluster housing. The rectangular insulator I installed on the outside of the cluster under the flat washers, insulating the connectors from touching the cluster back and grounding out.

Mine now work perfectly! I hope I didn’t just jinx myself!

Phil


Phil
Moderator, The Engine Shop, Interiors and Project Journals

1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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