The most popular Oil Pressure Gauge we sell is this mechanical engine mounted gauge that mounts off the Oil Filter housing. Fits all B,IB,C,CA, RC, G & all "W" series Tractors. (It's pressure range is approx. 0-30PSI.) Has a White face with the AC name on it. This gauge is a duplicate of the OEM gauge with the "Normal" sweep on the face. 1/8 NPT pipe thread.