Electric Gauges
 

So I'm getting ready to install a few gauges to monitor things. All of them are electronic AutoMeter gauges, just to keep fluids out of the interior, so they have their respective sender units.

First up is a Fuel Pressure gauge with a 1/8" NPT fitting on the sender. Where do I need to tap for that? Do I just T- into the fuel line somewhere, or is there a schrader valve anywhere (I couldn't find one)?

Next is the Oil Pressure gauge. My last car, I went straight to the block. The sending unit has a 1/8" NPT fitting on the end, and also has a 1/4" NPT adapter. Where is the best place to go for a reading there?

Finally, I'm installing a Pyrometer/EGT gauge. I'm going to have a 1/8" NPT threaded hole put into the log manifold to allow for the fitting AutoMeter provides. I know it's supposed to be 1"-2" away from the head basically, but was wondering if there is a particular runner people like to use to get the most accurate readings?

Thanks!

Cyl. #4 is the one you need to keep an eagle eye on IIRC.

The fuel pressure sender goes in the fuel feed line just before the rail. Here is a nice T fitting for a clean install.
http://cgi.ebay.com/ebaymotors/NEW-M...spagenameZWD1V

i thought it was #3 that would get the hottest.thats where i put my gauge:confused:

also drill and tap the mani on the bottom side so it looks cleaner:bigtu: .
i wish i ould have done that.:vash:

I put my EGT in the collector under the turbo.

i wonder if this effects the flow and spool up,of are turbos.
i think im getting run mine in the downpipe,when it gets warmer out.

Thanks! I'm guessing our lines are 3/8" then?
Also, from the looks of things, the fuel enters the left side of the rail, and exits the right, if you are facing the intake side of the engine. Correct?

No, actually they are 5/16".
-Michael-

most people with log manifolds put the EGT sensor in the collector before the turbo.

Let me guess, you used to own an aircooled Volkswagen?*

You will get a slightly cooler (and thus less accurate) reading by placing the EGT probe after the turbo. The usual location for the probe is in the collector section of the manifold, directly below the inlet to the turbine. I doubt very seriously that this negatively affects the flow through the turbo.

That being said, my EGT probe is in the downpipe just after the turbo. I did this for reasons of paranoia- it has been suggested that over time, the tip of the probe can weaken and eventually break off. Having the tip of the probe pass through the turbine wheel would probably have negative consequences.

Fuel enters near the front of the rail (front of car) and exits near the back. So if you're standing at the side of the car, facing the intank manifold, the fuel enters at the right, and exits at the left. Trace the short little vacuum line from the manifold to the little regulator can on the top of the rail- that's where the fuel exits.

*Explanation: Pre-1971 Beetles were notorious for the overheating of the #3 cylinder and resultant failure of the exhaust valve. This was due to the placement of the stock oil cooler, which pre-heated the air flowing over the forward half of the left head.

like this:

https://www.miataturbo.net/forums/at...1&d=1170127047


blue is feed, red is return (with a FMU plumped in, of course)

Lol i was waiting for that picture to come up in this thread.

Awesome! Thanks for the help there!