Life is too short for this sort of sruff but anyway here is what i found out so you dont have to!

First the temperature gauge with the numbers from the manual as to what it should be and in brackets what my resistance setting had to be.

This is with a standard multimeter and the test leads are 0.2 ohms which i didn't factor in so all readings will be 0.2 ohms out i guess.

Cold 76 ohms (not a lot i can do about cold)

Beginning of the band 36 Ohms (Needle actually started moving at 24 Ohms to get it to the C mark)

End of band 13 Ohms (12.8 Ohms see photo above)

Hot 9 Ohms ( 9 Ohms)

So temperature although not perfect at the colder end is completely fine as it warms up and thats really the important part and where it needs to work.

Second the fuel gauge

Empty 73 Ohms (Needle started moving at a lowly 40.5 ohms)

1/2 full 23 Ohms (19.2 Ohms)

Full 10 Ohms (10 Ohms)

So i wont run out of gas as the empty mark is way out of spec but in a good way where-as the 1/2 full isn't actually miles out and full is spot on.

I would be interested to know where 40 ohms is on a fuel tank sender as it may be that the 73 ohm reading is bone dry in which case 40.5 ohms could mean 2 or 3 gallons are left in the tank which is fine with me.

My voltage regulator tops out at 6.1 Volts or i would of tweaked it up a bit and give it a little more voltage and see if it improves these numbers.

The post

@FLCJ8 re-posted had a 5 volt regulator and there is no way 5 Volts would work accurately on ether this setup or the one thats currently in my 8 but that could just be something to do with my setup and gauges.

As also mentioned in that post i have no idea if temperature will affect any of this or the age of these gauges either as this one in particular hasn't been used for many years but seemed okay.

Just for information its been 21 Deg C today which according to my converter is 69.8F so warmish nut not too hot and not too cold either.

Tried to use the mechanical original regulator to compare but its either stuck on or there simply isn't enough load with just the one gauge so it just puts out 12 volts permanently which is no use to anyone.

Not sure if this post helps or confuses but i am quite pleased with the readings in my 8 just need a bit of time to find out how accurate all this is.