gauge fault
 

I have a 1987 ford f-150 with 5.0l. my speedometer and battery gauges work and oil pressure sometimes but most of the time I have no oil pressure gauge. I have no working fuel or temp gauge and part-time oil pressure gauge I checked the fuse and the plug on the back of the gauge panel what else could it be?

Don't expect ONE cause for several problems on a truck that old. Pick one, and diagnose it. If repairing that fixes something else, consider yourself lucky. Otherwise, just move on to the next problem, and diagnose it.

This caption explains the temperature gauge:

https://www.supermotors.net/getfile/...tempsender.jpg
(phone app link)

This explains the oil pressure, but keep following the string of links in the captions until you understand the system, and your options:

https://www.supermotors.net/getfile/...14oilgauge.jpg
(phone app link)

This album explains the fuel gauge & its most-common failure:

https://www.supermotors.net/getfile/...uellevel11.jpg
(phone app link)

This shows what's inside:

https://www.supermotors.net/getfile/...er8791tach.jpg
(phone app link)