Oil Pressure Gauge
CTPA-9A550 Replacement Part to Fit:  Allis-Chalmers For Models: B, C, CA, D10, D12, D14, (D15, D17 ALL Gas), WC, WD, WD45, WD45 Diesel Replaces: 70226967, 70228719. 50lb, 2" body diameter.  Price:  $8.37  Buyers Club Price:  $7.53