Need a wiring diagram for a 1994 case M series backhoe

go to the given link from where you will get the diagram easily http://toolsnyou.com/

Click on the link, I can only talk to you in automotive terms. I know nothing about a backhoe. The sending unit has to have voltage, correct? Get a resistor for empty and one for full, If the gage acts proper to the resistors, the problem is the sending unit.
If that isn't the answer you wanted, sorry, that's all I got.
http://www.tanksinc.com/index.cfm/page/ptype=results/category_id=159/mode=cat/cat159.htm

Hi Bill:
I'd check with my local Case dealer. We have several pieces of Case equipment with hydostatic drives.
If I remember correctly, high gear on a standard transmission is a 1:1 ratio in that the power is on a straight through shaft.
My suspicion would be that a shifter link ay have become dis-connected.
Here's a link that may assist.
https://www.google.ca/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=1987+case+backhoe+580k+4x4+transmission+diagram
Cheers

Here's a link on bleeding your system. 580 Case 580D Backhoe repair summary for hydraulic and brake systems...

You should be able to get that by going to the website for Gates rubber and belts.

I am sorry we do not have wiring diagrams here at Fixya.

On this website you find fuse box diagram and description for Acura Integra (1994 - 1997)

Acura Integra 1994 1997 wiring diagrams fuse block CARKNOWLEDGE

There's a service manual for '93 here ... (since 94 was the last year of that series I doubt if much changed):
http://myweb.dal.ca/is353832/93fsm/

Select Your Exact Vehicle:
1987 -1993 Ford F Series Wiring Chart & Diagrams
1994 -1996 Ford F Series Wiring Chart & Diagrams

Hope help with this (remember rated this post).