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Discussion Starter #1
Fired the up the 84 project for the first recently...Still shaking out the cob webs...

Battery connected or not the Fuel & Oil gauges are full scale?

Temp sweeps down when powered up?

Volts is working fine, clock is fine....

I'm chasing grounds...Any ideas?

Need a source for a wiring diagram :dontknow:
 

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Discussion Starter #4
Ok, fixed the Fuel sender, bad connection in the rear light harness...

The oil pressure sender is just a Switch?
How does the gauge read pressure??

The coolant temp is on an old 5 Volt circuit through the old computer...Any way to rewire that to work independently???
 

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If it has a oil light it is just a switch. If it is a gauge it is a sending unit. A gauge hooked to a light sending unit will peg as soon as it sees oil pressure.
The ecm used one sending unit for temp the gauge used a separate sending unit usually located in the drivers side head between #1 and # 3 cylinders(green wire).
 

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Glad you got them going.
 

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what color is the wire coming from the gauge? I am hunting the wiring after the wires exit the firewall. Its it green as well. 86 elky with factory gauges..

Marvin
 
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