I have ran a stock 24 chopper 7400, 26 ET 7300 and a 28 drag 4 copy 7400. I dont have a fuel pressure gauge. Compression is 150 psi plus or minus 2# per cylinder. I looked into a fuel pressure gauge but, was torn between a manual and electric. I have been told the maual should be mounted on the motor. Then, I cant see it at WOT. I have also read that the isolator that is used to mount a mechanical in the dash is very hard to get to work right, and that an electric is not accurate. So, I dont know what to buy. Thats the reason I dont have a fuel pressure gauge, dont know what to believe.