Best ones is a ARB(4wd store) / Bushranger(ARB owned) Merhnincal guage.
Sell them for bout $35 at 4wd shop in syd i use to work at.
use them hundreds of time while 4wd they awsome.
any 4wd shop/tyre place should have a merchanical guage round all thow i aseen them bout $60 sumtimes
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Im probly wrong so dont listen to me 
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