Stern shaft RPM indicator 1.Good price,cost-effective 2. ... 's panel:Front: sensor socket, power socket, fuse, indicator light, power switch. Back: output 1(analog), output ... Size:120*120mm Direct-viewing; high-precision; digital display tube with High brightness; (5) Operating temp:-40~60° ... Materials: Metal; good sealing,.proof splash; Shaft RPM indicator 300-0-300RPM /600-0-600RPM built-in power ...