Gauges Stuck

[timthescarrd]

AFAIK, the oil pressure sender located on top of the engine by the distributor, sends a signal to the oil pressure gauge only.  The oil pressure switch that the choke/light runs through (like your link was discussing) is located at the bottom of the engine just above the oil filter.

[Shawn0331]

I'm not sure, but both are missing on my truck.

[bd]

...I already knew that I've been having an issue with the fuel pump running after shutting off the engine sometimes....

This is normal for GM TBI square bodies.  Fuel pump afterrun is controlled by the ECM (or in some cases an under-dash fuel module).  Some electric pumps will run up to 15 seconds after the ignition is shut off.

[Shawn0331]

This is normal for GM TBI square bodies.  Fuel pump afterrun is controlled by the ECM (or in some cases an under-dash fuel module).  Some electric pumps will run up to 15 seconds after the ignition is shut off.

Mine ran for a good 15-20 minutes tonight at my parents house when I stopped by on my way home.

[bd]

That's not normal!      Might have a relay sticking.      Next time it happens, check the control circuit for the fuel pump relay mounted on the firewall.  Determine whether the relay is being signaled to stay on, or has gone rogue.   

See if your neighbor has the fuel/emission manual to go along with that wiring diagram manual he so graciously loaned.   

[Shawn0331]

Update:

I haven't found anything that looks out of whack, but decided to take apart the dash earlier this evening. I found spliced and frayed wires, but I think it's to the fuel selector switch. I only have one tank now and they previous owner bypassed the switch to only use the passenger side tank.

I'll post pics in a bit of what I found under there. While I've got it apart, I bought some new instrument panel bulbs and some chrome paint so I can brighten things up a bit. Saw an article on it and it looked like a good idea. http://www.73-87.com/7387garage/interior/dashlights.htm

[Shawn0331]

Here's the in-dash wiring I found:

[bd]

That may change the game.  You've got some work ahead of you....  If that's all the PO did, it's not too bad.  Hopefully, the rest of the wiring isn't like that.  At least, armed with the wiring diagrams, straightening it out is doable.

[Shawn0331]

My spring retaining clip stuck & I pulled a little too hard on my speedometer. Oops!

Got an entire dash cluster and a brass T fitting for my oil pressure switch and sending unit for $33 though.

[thefarmboy21]

I'm having the exact same problem with my 86 K20 with a 292. My oil pressure sender etc is all in tact and plugged up tho. I just got this truck from my Papaw, who bought it new, but it's been sitting since 06-07. All the gauges aren't working and my CHOKE light stays on all the time. It had the very same fuse blown as well. I haven't had much time to start tracking stuff down tho.

[Shawn0331]

Fixed! It was a stupid ground I had no idea was loose! After dropping the tank to check for bad wiring from the fuel pimp relay to the fuel pump because my relay was fried, I messed with this ground and it hasn't blown since.

[bd]

That grounding point is a common problem in these trucks.  Glad you found it.