no one i know could think how to do this in the car...?  so i spent the big buck ($7 ) and bought a amp gauge.  but try as i might i cant get my head around how to wire it in my 90 with 3 wire set up.  the dumb guage only has two wires, a + and -!  how hard can it be.... to much for me i guess.  any advice from anyone that has done this?  i suck at wireing.

You cut the big wire in half and insert the gage, prob the plus on the alt side.

see i did hear somthing like that, but it seemed wrong because i would be cutting an 8g wire to insert a 14g wire in it.

If the wires are small on the gauge you may be missing half of it.  check to see if the gauge is a volt meter. try it on a small battery first like a d cell batt.

after rechecking i guess there are no wires, just bolts to hook wires too.  i was looking at the small wires for the light in the guage  but, if i splice into the wire going from the alt to the bat. then i need to run 8g wire from there throught the firewall to the gauge and back.  is that correct?  still seems odd but if that is right i'll do it

I hate ampmeters you have to run all the power from your alt though it i for it to work right which means 6 to 8 feet of heavy wire for things to rub on and make neat sparks and smoke. plus a voltmeter gives you more useful real time info. I have one in the shop to test alts with but I run volt meters in all the rigs I have.

my .02
Thanks
Wayne

after rechecking i guess there are no wires, just bolts to hook wires too.  i was looking at the small wires for the light in the guage  but, if i splice into the wire going from the alt to the bat. then i need to run 8g wire from there throught the firewall to the gauge and back.  is that correct?  still seems odd but if that is right i'll do it

correct, you can get one with a shunt if you do not want to use yours.

thanks for the good info all!  i will have to think about it for a bit.... :-/