Thanks for response and I appreciate the suggestions. I have checked a number of sources including the two mentioned without success to date. The senders I have been able to locate are all for idiot lights. I bought the NAPA one some time back based on a counterman’s assurances it was for a gauge but found with testing it was a on-off idiot light sender. I think NAPA’s cataloging is conflating 56 and later Fords which did have idiot lights and 56 Mercurys with gauges.
As a follow up- turns out anti rattles for 1956 Ford 4 door sedans will fit 1956 Mercury 4 door sedans. Thanks to folks at Concours Parts and Accessories for agreeing to compare anti rattles and confirming fit.
