Sam, the 37mm appears to have been a fairly unsuccessful
( for Naval purposes ) Japanese army design.
My guess is the gun you're seeking is the rather
ubiquitous 25mm found in single, twin and triple
mounts.
However, the 37mm and Vickers 40mm guns ( I don't know
if captures/license-built, etc. ) are also said to have
been mounted on Daihatsu and used in land combat
by Japanese SNLF and Army units.
More however, the USMC map of Betio defenses
(
)
doesn't show any of the 25mm guns but does show artillery
sites of 3 calibers, including the 37mm ( smallest ) .
There is also the type 11 37mm infantry support gun,
designed to be carried by 4 men. Doubt this is the
weapon although it could be since by the time of
Tarawa ( Fall, '43 ) it was obsolete for the Army and
may have found it's way to Naval use. The light carriage
( no wheels ) would have also made it useful in arming
landing craft. Its ammunition probably would have been
ineffective versus tanks, but possibly effective versus
early LVT's and, firing HE, somewhat useful versus
MG positions ( an original purpose ) . Not saying this is
the one, though.
The other resource I consulted ( link )
shows no 37mm, but does show 25mm, so I am confused.
Sorry I can't be of more help.
explores another variant in the European Buildings range.