Rochester Gauges 47” Model 8600 Series Spiral Gauge. Tank depth should be at least 1/2” greater than the length of the gauge. The additional depth may be considered "reserve" at the bottom of the tank that will not be measured.
Designed for top mount
1-1/2” MNPT tank connection
TwinSite Sender Dial 240-30 Ohms, 0-90 Ohms or 0-30 Ohms