Tex. Transp. Code § 502.059
(d) Department rules may provide for the use of an automated registration process, including:
(e) Subsection (c) does not apply to:
(f) The registration insignia shall be attached to the rear license plate of the vehicle, if the vehicle is:
(3) oil well servicing, oil clean out, or oil well drilling machinery or equipment for which a distinguishing license plate has been issued under Subchapter G, Chapter 623.
Transferred, redesignated and amended from Transportation Code, Section 502.180 by Acts 2011, 82nd Leg., R.S., Ch. 1296 (H.B. 2357), Sec. 90, eff. January 1, 2012.
Acts 2013, 83rd Leg., R.S., Ch. 1291 (H.B. 2305), Sec. 13, eff. March 1, 2015.