NOVELTY - The assembly (100) has a first electronics module (120) communicatively coupled to a second electronics module (130) through a backplane. The backplane comprises a first printed circuit board (155) and a second printed circuit board (165) that are communicatively coupled to each other. A base metal ring (140) is placed between the circuit boards. The first printed circuit board is communicatively coupled to the second printed circuit board through connector holes in the base metal ring. Dampers (142, 149) are placed between the base metal ring and one of the boards.    USE - Downhole tool assembly for drilling application of wellbore e.g. horizontal wellbore, vertical wellbore, deviated wellbore, multilateral wellbore, u-tube connection wellbore, intersection wellbore and bypass wellbore, and well e.g. injection well and production well such as natural resource production well e.g. hydrogen sulfide well, hydrocarbons or geothermal well, and for borehole construction application for river crossing tunneling /tunneling boreholes for near surface construction purposes /borehole u-tube pipelines for transportation of fluid i.e. hydrocarbons, in measurement- while-drilling environment and logging-while-drilling environment.    ADVANTAGE - The assembly allows the dampers to be made of non-conductive material to prevent electronic signals from backplane printed circuit board from shorting against base metal ring in an efficient manner. The assembly electronically couples electronics in downhole tools without harness, while reducing noise and interference and improving tool performance in an efficient manner.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for operating a wire-harness-less assembly.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of wire-harnessless assembly mechanism.    Downhole tool assembly (100)    Tool insert (110)    Electronics modules (120, 130)    Base metal ring (140)    Dampers (142, 149)    Printed circuit boards (155, 165)