oil pressure reading?

Another thing to mention is 10 lbs. of oil pressure for every 1k rpm is just a "rule of thumb" meaning it's not written in stone. In fact it may be pretty hard to achieve that exact figure cause the oil pressure may not rise linearly. You'd probably either need to get super lucky to have it read exactly 10 lbs. for every 1000 rpm or have a special pressure relief valve built to make it accomplish that. Sometimes old sayings and rule of thumbs need to be taken with a grain of salt. Meaning you can get close but to be exact is probably nearly impossible.