Your right baddvw thats how i did my oil pressure. I put a small nipple in the block with a T. Once i did that i could run a guage and a light. Its better to be safe than sorry.

marty, we have both been to fire academy how many boring classes have to do with pressure loss hose size, distance, rise or fall. etc..etc..etc..... lol electric sends a signal from the sending unit to the guage and thats what the reading is a dummy light eliminates catastrophic failure and the elec guage will keep it accurate

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lets just ride

If you are running a mechanical gauge you should not have any difference that would be noticeable no farther than your running it.if you have a big difference then somethings not right.if it's ran hard lined of course.there is no flow so the water hose theory doesnt apply.and as for distance or gravity the only way you would have a way lower reading is if you was running 300ft of tubing straight up.imagine how much tubing it would take to hold a gallo of oil at say 5lb a gal,to create enough hydrostactic pressure just to make 5 lb difference.the electrical gauge is fine,less headaches,easier to wire and maintain.no matter which one you use put a lower pressure switch on it with a big bright dummy light and then you will at least be a lot safer.I need to put a new one on mine and it will be electric.I have always ran a dummy light in my dash and a mechanical gauge at my low pressure switch on the block.I just used t and screwed right in no tubing to pinch or leak and if I needed to see the pressure for some reason I had it.but as long as the light went off after I started cranking it I knew I had pressure.Chad

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NOW GAS IT!!!!!

OK ,,so I bid on and won some VDO electrical gauges ,,,but I needed 1/8 NPT,,these are too big,,can I mix and match brand sending units?

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If your clutch ain't slippin,, you probably got it adjusted right!!!!!