so the big brown mustang truck brought my tach yesterday (from summit) and it says its best to run the black wire to the - battery terminal, yet they put a short little length of wire on there that i dont think can reach across my car![:@] it says you CAN run to alternate gorund, but they dont recomend it. anyway, whats a good source for ground?

 

Ground it solidly to the metal dash.

 

yea ive always used the dash and they worked fine, wher are you putting it if you dont mind me asking, i have a 71 that has the factory tach but ireally dont think its all that accurate, and though about puttin one in but where to stuff the damn thing?

 

Which tach did you go with? I'm looking at the 5" Auto Meter 1499 8K tach from summit.

 

I went with sunpro II. its a little thing, 2 5/8". theres not a lot of room on the 70s for them and its tightso small is good. im putting it on the leftside ofsteering column. even though it isnt hooked up yet, i kinda drove around with it on there kinda loose so i can see where i like it. they say just put it on there with a hose clamp...but ihave to say, it looks kinda bad like that, even painted.
about the grounding, would just putting abolt through the dash and screwing itin beenough, or should i try to round up some soldering stuff?

 

all i ever did was install an eyelet to the end of the wire and drill a small hole if there wasnt one already to the very bottom part of the dash, in other words you couldnt even see it sitting in the drivers seat. and use a small sheetmetal screw then dab a coat of paint on the screw head. but i agree on the hose clamp deal it looks horrible, i have an older 5" auto meter monstaer tach, but i have nowhere to put it, my coupe has a factory tach, has the full guage package, has a/c so it has dash vents, and a full length floor console. as a matter of fact im gonna put up a post to see what some other guys did.