Grounding location Viglia 260 water temp guage

74gtsMember

I’ve rebuilt literally the entire coolant system of my fathers mostly original 74’ GTS and the good news is that I now have the overheating issues fixed, and the car is running extremely strong!

My last remaining issue is that my water temperature gauge will occasionally spike to 260 but I know the car is not overheating. Based on discussions with john Hass and in reading other forum posts, I am mostly certain it is an electrical issue.

I know the stock dash grounding location is extremely suspect and other recommend a fix being a direct ground from the back of the 260 (or 230) guage to the body. My question is where is a good location to successfully ground it direct instead if the oem daisey chain? Thanks!

3/24/248:38 AM

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huskerMember

The sender IS the ground (unless you have some modification I'm not aware of).

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3/24/2412:31 PM

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rockyMember

So based on the info in the schematic, it appears the circuit may have an intermittent short to ground…. (lower resistance = higher indicated temperature).

3/24/242:09 PM

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huskerMember

Or possibly a bad sender.

3/24/243:40 PM

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74gtsMember

I just replaced out the sender with one that was tested before going in yesterday, so I know it is OK. The sender already had a bit of white coating on the threads to seal it so I did not add any additional Teflon tape as I had read it could mess with the grounding.

I ran a new wire back in the gauge to the sender directly, so I know there is no issue along that route. I had read in the previous post where people recommended grounding the water temp gauge directly….so I was wondering if/how that is possible to try.

3/24/247:21 PM

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rockyMember

What I did in my secondary gauge (in my swirl tank) was clamp a grounding braid (a wire would do) around the body of the sender with a worm drive hose clamp, and grounded the strap directly to the body.

Rocky