digital oil guage
Reply #9 –
That may be true but it may still be a switch. The one Autozone has crosses as well, but I assure you, its a switch with a resistor inside. I opened it up after I crushed it (on my first attempt). The ECH OP6091 is the only one I can personally vouch for. Napa carries them, for a 74 bronco 351w. Maybe yours is just faulty.
Is there a little resistor pack inline with your harness? Usually its a barrel plug that goes into a little brick with harness tape then to a wire and the sender cap. If so, you need to pull that off.
Some background story:
When Ford used to install real senders, people understood that oil pressure varied with RPM. Sometime in the late 70s, they introduced their first oil warning system that would chime when oil pressure dropped below a certain level. People freaked out when on hot days in traffic, with the trans in gear the oil pressure would sometimes drop low enough to trigger the alarm. So the engineers at ford "fixed" it. They made an oil pressure sender that looked like a real sender. Inside was a switch and a resistor. The switch triggered at some PSI and the resistor put the gauge in the middle of the range. People stopped complaining.
A few years later, they incorporated a short resistor retrofit cable that attached inline with the sensor wire (brick mentioned above). This let ford install a standard switch (small body) on the engine and still have the gauge read perfectly in the NORM range.
By the time the MN12 was designed, they incorporate the resistor into the back of the instrument cluster. I had to bypass this resistor to get mine to work correctly in my supercoupe.
If you still have the resistor inline, the gauge will read low all the time. On my 88, i had the little brick wire. I simply disconnected the brick and connected the sender wire directly to the sender.
-Dan
Topic: digital oil guage (Read 2525 times)
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