ElQueFør

As some of you may know, I built up a 4L80 to put in my K5 Blazer. I didn't want to jack around with 4L60s in a heavy 4x4 truck with a SBC that must be making 350-400 HP.....

Well I've been driving the truck around and it shifts very firmly. I knew it would because I setup the valve-body for firm performance type shifts. I was planning on dialing the line pressure back in the tune to accommodate for it. It's an OBD1 7427 PCM running $0E code mask which was the factory TBI 4L80 setup... Anyways.... I'd like to mount a permanent pressure gauge in the cab to monitor line pressure. Anyone have any experience with this that might recommend a specific gauge and what pressure range?

badass68

iTrader: (7)

ElQueFør

Where did you get your transducer?

MaroonMonsterLS1

I also run a transducer and log...but I doubt you're going to be able to do that with your OBD1 setup

For a gauge you want mounted in the cab...literally do a google for a transmission (or oil) pressure gauge and pick one that suits your needs. I personally recommend digital gauge and up to 300 psi.

ElQueFør

I'm logging wideband data in place of the OEM EGR..... Could possibly do something similar with the trans pressure. I really don't want logging of trans pressure so much as just a gauge to keep an eye on things going down the road, but perhaps firstly, because gauges are cool

I'm not finding an electric pressure gauges that go high enough in PSI --AND-- are on the price point I'd like to spend.... Thinking maybe a generic pressure gauge like was mentioned for a compressor and some copper line might be the ticket.

MaroonMonsterLS1

80e regularly can see over 200 psi in reverse. If it has been a performance rebuild, it's nearing 200 psi in all forward gears also when on the throttle.
Personally, I try to keep 200 psi piping hot oil out of the passenger compartment. I've always disliked mechanical gauges for oil/water because I've seen more than one spring a leak.

I'm not sure what your budget is...but I find it hard to believe this can't fit in it.
http://isspro.mybigcommerce.com/r9125/
I doubt that comes with the sender (which is probably going to be more than the gauge) but...even at 150 total cost...That's not bad considering you're looking for a very uncommon gauge.
It's not like an oil pressure gauge that everybody makes (even those digital gauges are $60 for the cheepies)

ElQueFør

Yes, should be about 215+ PSI pretty much all the time in my case, I used the stiffer pressure regulator spring furnished the the CK kit to give that much pressure. I know what you mean, I used to be pretty opposed to running pressurized oil into the passenger compartment but after installing a mechanical oil pressure gauge in this same vehicle to replace the faulty GM oil pressure gauge I think it's ok. The key is to not use that crappy plastic line. Copper line and route it away from anything hot or that could rub a hole in it.

Also got it routed through a large cooler from a 1 ton super duty ford. Haven't seen trans temps higher than 145 yet, but we'll see when summer comes along.

I found this one for another option for an electric one though :
https://www.issprogauges.com/Classic.../iss-r8717.htm

MaroonMonsterLS1

you better be making 1000+ to justify that much pressure

ElQueFør

The instructions said to use that one for engines producing 600 LB FT. This thing should be about 500. I only wanted to do this once if in case I decide to turn up the wick later in one fashion or another.