I am seeing a huge price difference (or a misprint) from Jegs on fuel pressure 2 1/16 Phantom gauges. The mechanical is only 40-something bucks while the electrical is 190. What is the difference in accuracy and where the sender is located? What do you guys recommend?

Same Q for water temp I guess....

I already have a mechanical/vacuum boost ordered...

TIA

 

Any guage (with liquid) involved should be electric if not you'll be running hoses into your cab. I doubt you want oil, antifreeze, fuel ect. in the cab plus most mechanical guages are for the older car set ups especially fuel-- a carb is onlt like 12-15lbs and most still use a diaphram type sender so no fuel line goes in the car.
I did all the guages in my 02 fuel, trans and boost
and the fuel and trans were electric I know there pricey but so is everything now a days


Good luck
SLick

 

Ok...

The mechanical will require a $100 isolator, which you will need to fill with coolant. You DO NOT want raw fuel going into the cab. BTW, its a bitch to fill and purge this line and it HAS to be stainless, so you will need a much longer SS line.

Ive used both.. There is no difference in accuracy. Save yourself the pain, order the electric and be done with it.

 

Mechanical mounted outside the cab at bottom of windshield in my line of site. Good for the nitrous junkies

 

The autometer electrical high low gauge is nice.

 

HI!... O.K 1st off there are only two "MECHANICAL" AUTO METER gauges that actually have fluid run directly to the gauge it'self. OIL pressure and FUEL pressure. COOLANT temp, TRANNY fluid temp gauges use capillary tubing that has ethier in the tubing. As the temp from the probe rises the gas expands and moves the needle on the gauge. THEY DO NOT HAVE the ACTUAL fluid in them. So that info is very wrong. As for a oil pressure gauge, anyone that doesn't run -3 s/s braided line or copper tubing directly to the gauge, when mounting the gauge in the driver's compartment is just looking for trouble. And anyone running a mechanical fuel pressure gauge inside their truck is just plain out stupid. I've been running mechanical gauges for many years and have NEVER had a problem with them. Electrical gauge I have had nothing but trouble with and they are not as accurate IMO for temp readings.

 

i have the automer meter electric fuel pressure guage. Be sure to but they adapter to mount the send on the fuel rail, also , use teflon compound, not tape. My dircections said use tape, i almost blew up needless to say..........then i called them and they said the directions should say not to use tape....hehe, they didn't.

Guage is very good. I have the phantom guages. Fuel pressure seems to be right on point and reacts immediate with throttle response. Just be carefull, there was an issue with the wires popping out of the connector that plugs into the guage, i found out the hardway, how i noticed it I have no idea.

 

For what it's worth dept:

The new breed of electrial gauges are very much accurate and anybody that would run a mechanical fuel gauge in the passenger compartment is an idiot.

And anybody that would run a mechanical water temp/trans temp mechanical gauge in the passenger compartment is looking to get burned

 

 

Have you ever actually seen a mech. water/trans temp gauge?..Because that really doesn't make sense.

 

The ones I was talking about are the ones (old style...I guess)that the fluid ran to the back of the gauge. Must be really dating myself. And yes the ones offered now do NOT have a coolent running to the gauge. So I stand corrected by that dumbass statement.

But, I still stand by the mechanical fuel gauge comment

 

A mechanical fuel pressure gauge is in the cab is illegal in most if not all states.

The answer to the second part of your question is, the sender goes on the top of the fuel rail on the passenger side. You will most likely need an adapter that Autometer sells. I forget the part number.

I think I paid about $250 for my Autometer Lunar series fuel gauge, and worth it. 31-32 lbs at idle and 52 lbs at WOT, everytime. Gauge reacts instantly to throttle input.