55 400 instruments

Posted by happy On 2023/11/5 16:37:01

1955 Packard 400 instruments reading low

Converted to negative ground to accept solid state voltage regulator. Which seems to be working correctly. Input +/- 12 volts, output steady at 5 volts, via meter, and 12-volt test lit but dim.
Connected limiter output directly to gas gauge. Gauge came off peg and ruse to empty dot. Tank has 10 + gallons in it. Same for temperature gauge . Moves off peg to cold dot with fully warmed up engine. No response from temperature gauge. Using tap beneath oil sending switch for mechanical gauge. Oil pressure approx. 30 psi at warm idle
The same symptoms were present before changing to negative ground. I have no clue as to what to look for next. Any and all comments deeply appreciated!

Happy
(maybe not so much)