if you don't want to tap the intake manifold for the water temp sending unit. Use the hose going from the rear of the manifold to the heater core. Use a 1/2 t fitting with 1/2, 5/8 barbs. The id of those hoses is 5/8, not 1/2. The bushings they send with the sender can be used to install the sender to the t. Then just use a worm gear clamp to clamp a spade terminal to the t fitting, then attach the other end to a ground.