... uniform quality standard. N series&K series 4-cycle water-cooled diesel engine use in industry produced by Chongqing ... a.c. ampere meter, d.c. ampere meter, water temperature meter, oil temperature meter, oil pressure meter, fuel meter, contoller for protection ... box at bottom, contoller with four protections (high water temperature, high oil temperature, low oil pressure, over speed); also can design ...