Hello. Likely the wrong place for this question, but anyway, here it goes. We just took possession of an A Liner Classic. I desire to obtain an AMP Meter. I have what was sold to me as a dual volt and AMP meter which plugged into the cigarette lighter( yes, I am that old). Turns out it was only a volt meter. Looking for an AMP meter, they all seem to require instillation of some sort. Are there any that plug into the 12 volt receptacle? If not, which is a basic AMP/VOLT Meter i could have installed in the A LINER ,? Please advise. Thank You, K.H.