forward portion is in the form of a clevis 22 having legs 42 a which cooperate to define therebetween a slot 43 diametrically aligned bores 44 extend through the arms 42 a the yoke 40 is provided with a head 45 having a shank 46 integral at one end thereof with a coupling end 47 with flattened sides which extends into the slot 43 of the clevis 42 the shank 46 is integral at its opposite end with a drive square 48 a pivot pin 49 extends through the bores 44 and through a complementary bore not shown in the coupling end 47 for pivotally connecting the head 45 to the clevis 42 because of the clevis nature of this coupling it will be appreciated that the head 45 is capable of a pivotal movement through at least 180 degrees as illustrated in fig7 the strain gauge assembly 30 may be mounted on the shank 46 of the head 45 preferably being mounted on a side thereof the strain gauge assembly and the shank 46 may be enclosed within a suitable sheath 50 having a sleeve portion 51 which encompasses the adjacent end of a suitable cable 52 providing electrical connection to the strain gauge assembly 30 and extending through a suitable hole 53 in the yoke 40 for connecting to the electronics in the housing 15 in a known manner the side mounting of the strain gauge assembly 30 on the head 45 accommodates the full range of pivotal movement of the.