i hae a 3 gauge pod on a 97 dodge 3500 w/ a nv4500, i have a boost and pyro but what can i use to fill the empty space. i was thinking water temp and was wondering where to install sender? but i am open to some input.

There have been a few guys that run tranny temp gauges in there nv4500/5600 trans. Out of the water temp or oil pressure, I would go with oil pressure.

Doesn't the 12V have an accurate oil and temp gauge on the dash?I would consider fuel pressure over those two.

The water temp is accurate, I have the stock gauge and a mechanical one. The oil pressure is the thing that is an idiot, always showing 40 when it varies a lot if you hook up a real gauge. Fuel pressure is an idea though not really a 12V concern, but definitely neat to watch and find when the overflow valve/fuel pump/clogged fuel filter conditions are occurring. The redneck way to notice is just by feel, mine will even cease to smoke if any of those 3 things go bad. Right now I have EGT, indoor (in vent)/outdoor (zip tied to air filter for actual intake temp so I can see it compared to actual ambient), boost, water temp. Water temp is identical to the one on the dash so skip that one.

I'd like to see a fuel pressure gauge or trans temp if you haul anything.

May sound weird, but I've often wondered why there is never an A/C freon pressure gauge.

May sound weird, but I've often wondered why there is never an A/C freon pressure gauge.

I've actually wanted something like that too. But it would be a little interesting if it sprung a leak.

My vote is for fuel pressure... Even though the fuel pumps on 12V are rock solid there was a interesting article about lift pump effeicency and how the 12V lift pumps came up short on the upper RPM range...

If money permits, get oil and fuel. My .02 centsCould be well worth it if something were to happen.There are a few places to custom mount a 4th gauge that are fun to do and original.

oil pressure, oil temp, egt, fuel pressure, water temp.In that order more or less.You can get one of the new fancy digital gauges and monitor 25 million channels through your one extra gauge spot.

I would do a fuel pressure or oil pressure gauge if it was me.

I would do a fuel pressure or oil pressure gauge if it was me.

I concur. but having beat the snot out of a 12v, I'd go OP if it were me.

Not sure if you made your decision yet but given low fuel pressure is a I/P killer in your truck, I vote fuel pressure.