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The 1500HL auto I bought last summer has both an inoperative temperature gauge and fuel gauge. Is it the voltage stabiliser at faulty, or coincidental and simultaneous failure of the respective sender units?
Logic says a common fault is more likely than a simultaneous failure!
Were they working when you first got it? if not then all bets are off as you have no idea what a previous owner may have fiddled with.
If they were working then just do the usual, start at the voltage stabiliser, check for volts in and volts out and go from there -if it is the original bi-metallic sort then of course the output readings can be a bit random on a modern digital voltmeter.
For an electromechanical device the old style voltage regulators are remarkably reliable. The problems start with long over winter layups which give chance for the contacts to stick/corrode etc. Constant use keeps the contacts "electrically clean". As with most bits on the regular use is better than laying up - but then we all now that anyway
Roger