Help with voltage divider for boat trim sensor

[Gort]

Hello all,
I am trying to get a boat trim sensor and meter configured, this is a 12 V DC system. The sender that attaches to the trim unit is a potientometer, and shows 145 ohms at “full up travel”, and 62 ohms at full down. The meter requires 0v at full up and 8.5 volts at full down.
I created a voltage divider with a 500 ohm pot for adjusting the range, and I get the best results at about 122 ohms, but I am only getting about 60% of the indication on the trim meter (basically a voltmeter).
Somehow I need to increase the scaling, as I am stuck with the sender on the pot. Not sure how to proceed. TIA.

 

[Papabravo]

I'd be more interested in the opinion of the TS on the matter. This thread actually belongs to him.

 

[Nigel Goodwin]

I'd be more interested in the opinion of the TS on the matter. This thread actually belongs to him.

He's been given a number of options to consider, no one is forcing a particular option on him (although you seem to be averse to offering any modern solutions?).

 

[Papabravo]

He's been given a number of options to consider, no one is forcing a particular option on him (although you seem to be averse to offering any modern solutions?).

Your opinions are of little consequence to me.

 

[Gort]

I'd be more interested in the opinion of the TS on the matter. This thread actually belongs to him.

First, I have to thank you all again for the help, its been very informative and you all have been very generous with your time. I have all the components for the op-amp circuit, and I am looking forward to building it in the next week or so. Our local electronics shop which we are fortunate to have had everything.
On the Arduino, just a little more background, I program Labview, PLC Ladder, C++, etc. for part of my work, so the arduino should be fairly painless to learn for me. I do see the benefits and love the simplicity and adjustability. You could add debouncing, averaging, whatever. Very cool. Going with the op amp though, I am just really happy to be soldering up a circuit again after 50 years. Will post updates. Cheers!