Unfortunately, I actually tested my VDO dual sender on the engine I blew up. The red light came on at about 3 psi, the same as the switch did. Perhaps they make different versions of senders, I can't explain the discrepancy. You can rig up some fittings and tubing to hook up a manual gauge where the sender connects if you want to test it. I really doubt that your gauge is wrong, and your readings are exactly what I had on my engine before I threw a rod. 20 psi at speed is not good, there should be a minimum of 10 psi per 1000 rpm, or 30 psi at speed, 9-10 at idle. When mine dropped to 15-18 at speed the rod went within a few hundred miles and destroyed the engine. Rebuild the engine while you still have one to rebuild! I paid the ultimate price for the denial you now have. Stuart |
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