I bought an oil pressure gauge for my B from Sandy Lake Implement. Part # 70207834. It had "Allis-Chalmers" on the face. I bought it in the beginning of the year. I think it was around $28. There are a few cheaper aftermarket gauges out there, but I wanted the OEM style guage with the Allis name. Betty is who you want to talk to in the Parts Dept..... Steve B.