Moeller 035726-10 Fuel Tank Level Sender and Electric Gauge Combo

Moeller. USA made.
Universal electric sending unit.
Industry standard - calibrated to 33 approx. 240 ohms. 
For tank depths 100mm (4') to 685mm (27').
Swing arm rotates in 90 degee increments for tank wall or baffle clearance.
Dash mounting gauge.
Comes complete with 5 hole gasket and mounting screws.
5 screw fixing on 2.1/8' (54mm) centres.
Suitable for petrol (and diesel if separate return line is available) only (not water).
Note: sender ground terminal is electrically connected to tank.
(Note: gauge not recommended for personal watercraft [PWC].
(Sender only available, Moeller's code IN1725)

Wiring the gauge: Rear view of gauge. 
Left terminal (S) to sender screw terminal.
Middle terminal (G) to ground (battery negative).
Right terminal (I) to ignition (battery 12V positive)