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prostardad
09-18-2013, 02:31 PM
I just purchased a 1992 MC Prostar 205. The oil and fuel gauges do not work. The volt meter and engine temp gauge work fine. The previous owner said the sending units were bad. I replaced the oil sending unit, but the gauge still registers 0 psi. The oil level is fine. I have not tested the oil pump yet. I hear a faint audible squeal when the engine is running. Itís coming from a circuit board behind the dash.

Is the noise a low oil level warning or something else?

What are the other causes for the gauge to read 0 psi?

How would I check to see if the gauges are bad?

Is there a common ground that the oil and fuel gauges use and maybe corroded?

Thanks for helping.
SWH

j.mccreight@hotmail.com
09-20-2013, 09:36 PM
Yes there is an audible alarm in the dash for oil psi, voltage and engine temp.
To test fuel gauge, access fuel level sender, key on, remove pink wire and ground it, the fuel gauge should peg past full if not test at gauge itself eliminate wiring, if gauge moves then a bad sender if doesn't move bad gauge, with the sender signal wire(pink wire) disconnected the gauge should read below empty. Same test for oil psi gauge except its a light blue wire(iirc).

prostardad
09-21-2013, 07:57 AM
Thanks MC Maniac, this is exactly the type of info was looking for. SWH

cesarcis
10-02-2013, 01:47 PM
Upon start up my fuel gauge goes to full and does not move. Does this mean a bad sender?

cesarcis
10-02-2013, 02:08 PM
Upon start up my fuel gauge goes to full and does not move. Does this mean a bad sender?

j.mccreight@hotmail.com
10-06-2013, 10:38 PM
Upon start up my fuel gauge goes to full and does not move. Does this mean a bad sender?

Yes, more than likely its internally grounded, or possibly a short to ground in the fuel level sender circuit. Disconnect the signal wire with key on and see if the gauge doesn't move.