VDO-310-303 - 310303 - SERIES 1 TRANSMISSION TEMP GAUGE-400F - 2-1/16 (52MM) IN.

Here are the senders for this gauge.
VDO-323-050 1/8 - 27NPT, Standard Ground (Long Probe, 5/8" long) Ford
VDO-323-086 1/8 - 27NPT, Standard Ground (Short Probe, 3/8" long) GM
VDO-323-091 M10 x 1.5, Standard Ground