Stock gauges

[Tazman]

I do not know how many out there are running stock gauges but I am preparing to go back to them. Right now I have mechanical ones under the dash and I want to clean things up. I know I need to change the sending units for both the oil and coolant. My questions are this what color will the wire be that goes to the oil sending unit? Also what else will I need besides the sending unit? I have new gauges and the circuit board is just two years old.

Thanks

[hatzie]

Assuming it's the 1987 in your signature.
The oil gauge sender wire is Tan.  There should be an oil pressure switch for the fuel pump as well.

[Tazman]

Great I will look for that tan wire, as for the fuel pump that gauge has always worked great. So hooking that wire to the oil sending unit the gauge should work?

Thanks,

[Irish_Alley]

Assuming it's the 1987 in your signature.
The oil gauge sender wire is Tan.  There should be an oil pressure switch for the fuel pump as well.

on my 91 i have 3 wires into the oil pressure switch. orange (fuel pump relay) gray (for the ecm) and tan (for the gauge).

[Tazman]

In looking for that tan wire I have a female plug coming from the top of the coil. It has a red wire and a tan wire going to it. The red one goes from there to the back of the distributor, the tan stops with the plug. That is the only tan wire I have found so far. This will be coming from the firewall correct?

[bd]

Look down  by the oil filter.

[Tazman]

Look down  by the oil filter.

I just did, is that the other sending unit? Does that wire go to the other sending unit by the distributor? Does one go to the ECM?

Thanks

[bd]

The oil pressure gauge "sender" has only one terminal, appears similar to the image below, and should be located down by the oil filter.  The two-wire oil "switch" located adjacent to the distributor is the failsafe backup for the fuel pump.

[Tazman]

I have a mechanical sender now and the line goes to the unit by the distributor down and into the cab to the gauge. So that is supposed to be the backup?

[Irish_Alley]

the two wire one will look like the oem one will be a couple inches longer but the same idea. they just changed the design within the past year. but this one is the back up

[Tazman]

http://www.oreillyauto.com/site/c/detail/ACD0/D1838/03438.oap?year=1987&make=Chevrolet&model=R10%2BPickup%2BRWD&vi=5002896&ck=Search_oil+pressure+sensor%21s%21switch_5002896_3645&keyword=oil+pressure+sensor%21s%21switch#

Won't this work?

[Tazman]

the two wire one will look like the oem one will be a couple inches longer but the same idea. they just changed the design within the past year. but this one is the back up

The wires from the sensor by the oil filter go to the ECM or the gauge?

Thanks

[Irish_Alley]

it says 2 wires but theres 3. its my only oil sensor and my gauges work and my fuel pump replay work. the only thing not hooked up is the ecm but that gray wire just got cut

[Tazman]

Well I just found the wire buried and in need of cleaning. I see two wires with a plug type that will not work with the sensor you last showed me. I do not think the one I showed will work either. At least I have the wire.

[bd]

1987 TBI had one oil pressure "switch"...

         

...adjacent to the distributor for fuel pump backup power (orange wire connected to fused B+ and tan/white wire connected to fuel pump & ECM)...

...and one oil pressure "sender"...

         

...located directly above the engine oil filter for the factory oil pressure gauge (single tan wire). 

The two oil pressure sensors (switch and sender) operate independently and are electrically isolated from one another.

The switch that you linked...

http://www.oreillyauto.com/site/c/detail/ACD0/D1838/03438.oap?year=1987&make=Chevrolet&model=R10%2BPickup%2BRWD&vi=5002896&ck=Search_oil+pressure+sensor%21s%21switch_5002896_3645&keyword=oil+pressure+sensor%21s%21switch#

Won't this work?

...is for a dash low oil pressure telltale and will not work for a gauge.