47-55.1 Stock style gauges - Temp Sender and SBC

[PurdueSD]

I purchased a set of stock style gauges (12V) for my '51 pickup from classic parts a couple years back. I'm finally now in the process of wiring/ plumbing and have ran into a snag.

The temp sender on the stock style gauge has probe that is too long. The probe bottoms out before the 1/2" npt threads can engage. It's about twice as long as the probes my donor '87 350 had in both the intake and head.

Anybody run into this?