Help.......
Have a tach called "Advanced Digital Tachometer Voltmeter"
Model 602-1.
Operated by pushing a button repeatedly, which cycles the tach thru 2,3,4 blade props then 4.8 and 9.6 V.
2 problems, on first selection, every 'bar' on the display partly lights up and its hard to see the reading. The other problem is it eats 9 V batteries, I thought it may be 'bumping' itself on in the flight box, so now I disconnect the battery when not in use. Any ideas ?
Thank you