Wiring harness help

[Lonewolf1990]

So I just got my 77 620 back I put a ka24e engine in it , it runs but I have no gauges , and wiring is a mess!!! Does anyone have a good electrician near the San Gabriel valley area please help 

[datzenmike]

The KA temp sender should work the 620 gauge. Find the 620 temperature sender wire. It's Yellow/Black stripe. The KA sender is likely on the intake near the thermostat.

 

The KA oil pressure sender should also work. Find the Yellow/White wire and connect to the pressure sender on the side of the block.

 

You will need to convert your externally regulated alternator wiring harness to internally regulated and swap a later KA two wire alternator plug on. I doubt the 35 amp 620 alternator will have a stable enough voltage output for EFI. 

 

 

[yenpit]

On 12/7/2022 at 10:46 AM, Lonewolf1990 said:

So I just got my 77 620 back I put a ka24e engine in it , it runs but I have no gauges , and wiring is a mess!!! Does anyone have a good electrician near the San Gabriel valley area please help 

 

A tough find these days, anywhere!  I am not aware of an auto electrical specialist here in Denver, willing to take on old classic cars.  We just "restored" a 240Z engine compartment harness here at work (vintage race shop)............it is a massive amount of time/labor to do it correctly, this one cost the customer around $1000!!  That is "restoring/repairing", not

 

Some dash harnesses are also cut up & mangled pretty badly by numbnutz that don't know what they are doing.  That said, you might be able to find a much cleaner DASH harness than what you might already have, but you would need to locate a suitable year range.............if I was to GUESS, maybe 75-77 620??  I know there were electrical changes compared to the 73-74 620 & the 78-79 620.  The reason I mention this, is because I do mostly 68-73 510 parts, including selling every good USED wiring harness I find!  As an example, here is what fits within the 1968-1973 510 range............68 only, 69 only, early 70 only, late 70-72 are basically the same & 73 only.  This complicates selling to buyers!  The 620 MIGHT be just as complicated? 

[FrankRizzo]

Put Speedhut 3 3/8 gauges in it and run all new senders. They make a 4 - in - one gage with temp, oil, fuel and alt that drops in, and a tach. I went GPS speedo too. It works great.