need help with oil sending unit

Mineral Gray GT · May 30th, 2011, 10:24 PM

my BIL has a 1991 GT with a built 331 stroker that we're trying to put an aftermarket oil pressure gauge in. There is no sending unit in the block and when we pulled the gauge cluster out of the dash, the leads on the back of the cluster that lead to the oil pressure gauge is broken. so he is going to order a new gauge cluster but we need to know what oil sending unit we need to buy. is it mechanical or electric? part number? If electric, how do we wire it? If you need anymore information about the car please ask. Thanks in advance.

Mineral Gray GT · May 30th, 2011, 10:32 PM

I'm clueless when it comes to this oil pressure stuff. If he wants to run a mechanical gauge, then do we just hook up an oil line to the fitting on the block and run it to the gauge?

93hatch · May 30th, 2011, 10:36 PM

yes for a mechanical gauge you just run the nylon tube from the oil pressure sending unit spot to the gauge. For the stocker its one wire thats part of the fuel injector harness that goes on the stock sender

FastStang91Lx · May 30th, 2011, 10:37 PM

Yes on the Mechanical, and the oil sending unit is supposed to be located up by the first cylinder on the driver's side towards the front of the car (#5 cylinder). Mechanical is more accurate, but if he can repair the broken wire, and the factory wire still exists (has a 90 degree boot on it and should be somewhere up there, maybe by the injectors), then it'll be easier.

FastStang91Lx · May 30th, 2011, 10:38 PM

Beat me

93hatch · May 30th, 2011, 10:43 PM

off

FastStang91Lx · May 30th, 2011, 10:49 PM

Mineral Gray GT · May 30th, 2011, 10:51 PM

okay thanks guys. I understand it a little now. The factory wiring for the electric sending unit is gone. I have no idea what moron took it off and why. it was gone when he bought the car. He has an aftermarket mechanical gauge that he bought at autozone with the plastic line. Will that line be sufficient? If not, I'm thinking about telling him that he's messing up putting the mechanical gauge in and that he should just buy a new pig tail for the electric unit.

93hatch · May 30th, 2011, 10:57 PM

autometer mechanical gauge is 55 bucks with everything you need

FastStang91Lx · May 30th, 2011, 10:59 PM

You said it has no sending unit at all? Did they just put a plug in it? Mechanical is more accurate, just keep the line routed away from the headers, lol. Now the question remains: Is cheap mechanical still better than factory on/off style pressure switch? Probably.

FastStang91Lx · May 30th, 2011, 11:00 PM

To Hatch: I think the dude from Florida 5.0 said they send braided line with their units for temp and water. Hope I heard him right!

93hatch · May 30th, 2011, 11:07 PM

mine just came in with a vinyl tube, prob cuz I got cheaper crap. They sell an upgrade kit that is copper

ryanw · May 30th, 2011, 11:08 PM

the oil sending unit is about 8" from where the battery is grounded to the block

93hatch · May 30th, 2011, 11:10 PM

May 30th, 2011, 10:24 PM	#1
Mineral Gray GT Regular 2002 Mustang GT Join Date: Nov 2010 Location: Easley, SC Posts: 213 iTrader: 0 reviews	need help with oil sending unit my BIL has a 1991 GT with a built 331 stroker that we're trying to put an aftermarket oil pressure gauge in. There is no sending unit in the block and when we pulled the gauge cluster out of the dash, the leads on the back of the cluster that lead to the oil pressure gauge is broken. so he is going to order a new gauge cluster but we need to know what oil sending unit we need to buy. is it mechanical or electric? part number? If electric, how do we wire it? If you need anymore information about the car please ask. Thanks in advance. __________________ 2002 Mustang GT- built C head 4V swap in progress FOBRA CLUB MEMBER #7

May 30th, 2011, 10:32 PM	#2
Mineral Gray GT Regular 2002 Mustang GT Join Date: Nov 2010 Location: Easley, SC Posts: 213 iTrader: 0 reviews	I'm clueless when it comes to this oil pressure stuff. If he wants to run a mechanical gauge, then do we just hook up an oil line to the fitting on the block and run it to the gauge? __________________ 2002 Mustang GT- built C head 4V swap in progress FOBRA CLUB MEMBER #7

May 30th, 2011, 10:36 PM	#3
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	yes for a mechanical gauge you just run the nylon tube from the oil pressure sending unit spot to the gauge. For the stocker its one wire thats part of the fuel injector harness that goes on the stock sender __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

May 30th, 2011, 10:37 PM	#4
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	Yes on the Mechanical, and the oil sending unit is supposed to be located up by the first cylinder on the driver's side towards the front of the car (#5 cylinder). Mechanical is more accurate, but if he can repair the broken wire, and the factory wire still exists (has a 90 degree boot on it and should be somewhere up there, maybe by the injectors), then it'll be easier. __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

May 30th, 2011, 10:43 PM	#6
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	off __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

May 30th, 2011, 10:38 PM	#5
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	Beat me __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

May 30th, 2011, 10:49 PM	#7
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	__________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

May 30th, 2011, 10:51 PM	#8
Mineral Gray GT Regular 2002 Mustang GT Join Date: Nov 2010 Location: Easley, SC Posts: 213 iTrader: 0 reviews	okay thanks guys. I understand it a little now. The factory wiring for the electric sending unit is gone. I have no idea what moron took it off and why. it was gone when he bought the car. He has an aftermarket mechanical gauge that he bought at autozone with the plastic line. Will that line be sufficient? If not, I'm thinking about telling him that he's messing up putting the mechanical gauge in and that he should just buy a new pig tail for the electric unit. __________________ 2002 Mustang GT- built C head 4V swap in progress FOBRA CLUB MEMBER #7

May 30th, 2011, 10:57 PM	#9
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	autometer mechanical gauge is 55 bucks with everything you need __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

May 30th, 2011, 10:59 PM	#10
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	You said it has no sending unit at all? Did they just put a plug in it? Mechanical is more accurate, just keep the line routed away from the headers, lol. Now the question remains: Is cheap mechanical still better than factory on/off style pressure switch? Probably. __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

May 30th, 2011, 11:00 PM	#11
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	To Hatch: I think the dude from Florida 5.0 said they send braided line with their units for temp and water. Hope I heard him right! __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184 Last edited by FastStang91Lx; May 30th, 2011 at 11:14 PM.

May 30th, 2011, 11:07 PM	#12
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	mine just came in with a vinyl tube, prob cuz I got cheaper crap. They sell an upgrade kit that is copper __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

May 30th, 2011, 11:08 PM	#13
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	the oil sending unit is about 8" from where the battery is grounded to the block __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

May 30th, 2011, 11:10 PM	#14
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	__________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

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