Does anyone run a permanent guage in the engine compartment or is it not needed? The application is a single 4150 carb setup. I tried to buy a guage from summit a few years back and they didnt even want to sell me one if I was going to mount it perminantly!

I have had issues with flakey/failing (gaffrig) sending units in the past on my 575sci and ended up mounting one on the throttle body, I have not had any problems but I am rethinking the wisdom on this.

Also what about liquid VS non liquid filled?

I put them on nearly every boat i have ever had, usually right at the carb inlet.

Ive ran a summit brand liquid filled permanently mounted on a street car. The car has more cam than we can run on the water so it shakes things pretty good and it been holding up for about years. I would think it would work just as good in a boat.

You prefer liquid or non liquid?

liquid for sure, keeps the needle a little more static.

I've got them on mine. I have to replace one since part of the needle broke off, but Its nice to have when comparing to goofy sending units. I want to do something for oil pressure too since one side seems to drop lower than the other, but both run around 60 under load, but thats another story.

Im running them, liquid filled, screwed into the EFI bypass regulator

Liquid on the engine and I'm installing some in the dash eventually.

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Rookie, if that is a summit gauge it is exactly the one I bought with the silver styled face.