Cool, I'll give them another look then.There is a function on those kit car pod type all in ones that lets you calibrate whatever sensors you have, the optional sensors are exactly that.
Bob
I used the Smiths magnolia gauges in wifey's Pop project.Sounds like an interesting idea. I did that with my LPG sender which I calibrated to the original fuel gauge. I may still have the program in my files if you want to see / play with it.
The Smiths range of classic gauges are nice, I m used them in my Scimitar but £700 the set some years ago makes them a luxury. Chrome and magnolia does look good though. :-) Another conventional gauge option is the Indian clones of Smiths gauges.