440 PHIXX
The Island of Misfit Mopars
You could order a clock, tachometer, or oil pressure gauge. I’m going with the tach.
68-70 2984487 Oil Pressure Gauge
- Thread starter smithchargers
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As I've noted noted several times previously, the Mopar gauge shown above and the Mopar Rally gauge instruments are literally DC volt meters (showing 0-5 volts at full scale) CALIBRATED to show either FUEL, OIL PRESSURE OR TEMPERATURE, depending on the RESISTANCE of the fuel tank sending unit, the oil pressure sending unit or the coolant temperature sending unit. Those three instruments are thermal type devices, deliberately slow to respond to dampen any minor fluctuations in what's being measured....fuel level, oil pressure or temperature. ALL OF THESE instruments require a steady (+/-) 5 volt supplied by the Instrument panel voltage regulator. THE ONLY EXCEPTION IS THE ALTERNATOR or AMP GAUGE, which is powered by the current flowing thru it, either + or -.
The respective gauge's sensor responds to the measured resistance and causes the Instrument panel gauge to respond accordingly.....fuel level, oil pressure or temperature.....these instruments provide an INDICATION of the measured quantities but are not 100% absolute or accurate. After 50+ years of operation, it is highly likely that their calibration and accuracy and response time has deteriorated.......just my interpretation of their operation.....
BOB RENTON
So, what did you end up using for your sending unit? Also, did you keep the idiot light?
smithchargers
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smithchargers
Well-Known Member
I used the large bell type sending unit that would have been used on any mopar that came with an oil pressure gauge such as one for a 70 b body with rallye cluster. I did keep the oil light by simply keeping the factory sending unit as well. I have a sending unit on each side at the back of the block.
Thank you sir. I had started looking for one after reading through this thread and was a bit surprised to see how many senders are for sale without listing any specifications regarding their voltage needs or if they are 80 psi type senders. I think I was overthinking it. Having an application solves my problem.
Edit: This should be the sender, if someone isn't looking for an actual Mopar part.
Standard Motor Products PS-59 Standard Motor Oil Pressure Gauge Sending Units | Summit Racing
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Moe-Parr
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how did you install yours??? electrically
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IMO.....the problem with electrical oil pressure (and temperature) instruments is they are subject to the vagaries of electrical systems.....compatibility with the sending unit, steady and a reliable voltage source, loose connections, and overall accuracy. For critical systems.....a direct reading mechanical oil pressure gauge and a direct reading mechanical temperature gauge (which is actually reading vapor pressure of the sensing element immersed in the coolant on a calibrated scale that reads temperature). They are simple devices not subject to the same issues as electrical instruments and respond faster than the electric instruments. In my GTX, i use mechanical Autometer 2-5/8" diameter case instruments, mounted under the dash, canted slightly for better line of sight view. The origional electrical instruments are present and totally functional but because they're thermal type devices, they are slow to respond. .....
BOB RENTON
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