Hey guys I'm pretty new to the jet boat world, but I just changed the oil in my big block 427 Chevy and have a 10qt pan, I put 10 quarts and a bottle of slick 50 oil treatment, my gauge is reading 100 psi is that high


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did it read that high before? Sounds like your sending unit mite have took a crap.


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Do you have an electrical or mechanical gauge? If electric, just like Jake said, perhaps your sending unit craped out, if there is an open in the wire the gauge will max out. I also read that you have a ten quart pan and you put ten quarts of oil in with an additional quart of Slick 50, I think you are a tad over full, but this is not the cause of your high pressure reading. Normal cold thick oil pressure at idle can be 70-80psi until the oil thins out with heat.

Do you have an electrical or mechanical gauge? If electric, just like Jake said, perhaps your sending unit craped out, if there is an open in the wire the gauge will max out. I also read that you have a ten quart pan and you put ten quarts of oil in with an additional quart of Slick 50, I think you are a tad over full, but this is not the cause of your high pressure reading. Normal cold thick oil pressure at idle can be 70-80psi until the oil thins out with heat.

thanks for the info Its an electrical gauge so It could be the sending unit, but the slick 50 wasn't a while quart.  But either way you say that's not the reason the psi is really high which is good so would you say it narrows it down to the sending unit or a break in the wire ?


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I had same problem with using stock sending units so I went to pep boys and got the good auto meter sending unit and seems to give me a lot better read

Around 40 bucks I got the temp one too and I'm impressed with them both alot more accurate read

awesome they have both of them there, thank you for the info I'm heading down there right now


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Make sure you get the same resistance or your gauges won't read correct. I put new gauges in mine a few weeks back, original oil gauge read 75psi at idle, new gauge read 17psi at idle. Scared the hell out of me.