The first is to remove the stock Oil sender unit for the warning light on your dash, most cars this sensor is not connected to your PCM and removing it will not affect anything.
You could also install a t-fitting that you can purchase from a local hardware store in order to hook up both factor and aftermarket senders.
Confirm this with your dealership or owner's manual before removing the sensor. If everything is ok then you can install the sender that came with the gauge.
Follow the Link.
Hope This Helps.
It doesn't have a test port. You have to fabricate fittings to tap into the fuel line at the fuel filter to connect a fuel pressure gauge. They probably sell a kit to do that but I made my own.
About the only thing they have in common is the headlight switch. Have it checked out.
with your eyes
OK, you have a 1989 S-10 Blazer. What is your question?
weak oil pump, worn crank shaft bearing, or a bad oil pressure gauge all these can be contributing factors. Best place to start is with the pressure gauge.
What about it?
On a 1989 Ford Aerostar : I believe the oil pressure sending unit for the oil pressure gauge on the 4.0 liter EFI , V6 engine is on the drivers side of the engine below the power steering pump
No it will not even bolt up. GM redesigned the transmission and its not even close to being the same as the 1989 trans.
I believe that the first digital cluster on a S-10 Blazer was in 1989.
1982 - 1994 (early year models).
The oil pressure sending unit is by the oil filter. There are 2 different types. One for a gauge and one for a light. Make sure you get the right one.
there are straps that bolt to the frame loosen them and disconnec the fill tube, pressure, return, and vent lines and lower it carefully