Well I just my ute back on the road last week but theres a few problems with it. I've put in a tacho which was working fine in the sedan.The tacho only seems to work when it fees like it. when it the tachos running the motor runs well making some decent power, when the tacho stops and starts jumping round it turns to sh#t. Any ideas? What needs replacing? Thanks.

is your alternator cutting at your battery lead mine did that when my batt bracket broke and fell into the alternator

Ive lost two batteries through the notorious blades of the alternator. Its an unforgiving piece of machinery. Anyways have you checked your coil it could be packing it in.