yeah dd, didnt you know that for every inch in diameter size over 4" in tach size, you need an additional 40hp to make it turn!!
Its a bit like how a ford 9" will suck about 60hp to turn, a 5" tach needs another 40hp!!!

Quote:That's funny! It's false, but like what are they thinking? That the A12 only has enough horsepower to turn a 4-inch tach, but not a 5-inch tach?

$40..has he got another one...actually make that 5. i fit one in my stock 1200 ( at the time) and worked fine as everyone else has already said.

ok thanxs guy Cheers.. Rick i will ask my friends for the instructions as i bought it for $40 second hand

Rick,
got one in my racecar and just followed the instructions in the box - no problem
Must be an installation problem I suspect. Follow disco stu's advice I reckon and it should be sweet.
Good luck.
Cheers

The Tacho would be drawing only minimum power, so getting a new alternator wouldn't be the solution. It sounds as though you've got the wiring wrong in some way. Check out the mounting instructions the Tacho's on Autometer to see if you've got it right. Then match that with Tacho Diagram to see if anything is wrong. Let us know how you go!

its all connected to the coil u reckon i would need a biiger alternator??

Most aftermarket tachometers connect to the coil minus side. Did yours not come with wiring instructions?

i bought a 5 inche taco with shift light and when the car is running i hook them up and the engine just stops just wondering what i need too make it work some people say the engine cant take it and some say its not hooked propally if anyone can help will be greatly appreciated Cheers Rick