Hi: Bought a 66 SS with the Oil Pressure Gage off scale high. Came that way. Just had the motor professionally re-built and at the shop it's showing 40 lbs at idle. My mechanical gage is outta sight. Installing a 3 gage under dash setup. Can I buy another pressure gage to fit or do I have to send it out for repair? I still would like it working even though I'll have a new three gage setup to rely on..ALSO-The pressure fitting is new with a new line....Any suggestions guys....?????????????